Iwatsu Electric
Corporate brand
UnclaimedA Japanese electronics manufacturer whose historical businesses span communications equipment, oscilloscopes, reprographic systems, and related components.
Last updated August 26, 2026
AI crawler reads
No AI crawler has read this profile since Oct 28, 2026.
Overview
Iwatsu Electric, formally Iwasaki Tsushinki Co., Ltd., is a Japanese electronics manufacturer established on 14 August 1938 by entrepreneur Seiichi Iwasaki. The company originated in the communications sector, initially developing specialized telephones for infrastructure operators whose long-distance lines were vulnerable to inductive interference, signal loss, and eavesdropping. Its early products included anti-induction and anti-tapping telephones, carrier-current telephones, and the relays, transformers, capacitors, and other components required to manufacture them. The business expanded alongside Japan's communications infrastructure. In 1939 it moved production to a larger factory in Karasuyama, Tokyo, and during the Second World War it was one of three Japanese companies asked to develop a radar-warning system. Iwatsu's prototype was judged the strongest of the three and the company subsequently received an order for mass production. A larger headquarters and factory complex was completed at Kugayama in 1943; that area remains associated with the company's headquarters. After the war, Iwatsu had to redirect its engineering and manufacturing capabilities toward civilian products. The company developed common-battery telephones and resumed supplying communications equipment during the reconstruction of Japan's telephone network. Nippon Telegraph and Telephone Public Corporation became a major customer after its establishment in 1952. Iwatsu also built a national sales network and supplied magneto telephones, dial telephones, subscriber equipment, private branch and key telephone systems, and radio-communications accessories. A second major business emerged from measurement technology. Working with the Far East Air Material Command, Iwatsu developed the Synchroscope, described in company history as Japan's first oscilloscope. Its waveform-hold capability made it useful for observing radar and television signals. The product evolved as broadcasting and electronics engineering created demand for larger displays and wider frequency ranges. Iwatsu later diversified again into electrophotographic reprography after licensing technology from RCA. The ELEFAX PC 201 was presented in 1960 and the PC 301 was released in 1961. The company became publicly traded in 1953 and was placed on the First Section of the Tokyo Stock Exchange in 1957. During Japan's postwar high-growth period, Iwatsu expanded production, research facilities, and overseas activity. It opened a technical research laboratory in Hachioji in 1964, established a trade department in 1966, and entered international markets through exports and trade fairs. In 1967 it won a Kuwaiti government tender for key telephone systems, its first large-scale export order for that product category. The company adopted the abbreviation Iwatsu as its official short name in 1967. Iwatsu's brand heritage is therefore rooted in practical communications engineering rather than consumer electronics. Its historical identity combines telephone and business-communications equipment, electronic test and measurement instruments, and office or reprographic technology. The available reference material does not establish the company's complete present-day product portfolio, current management, current ownership structure, or present operating status, so those details require verification before publication.
History
Iwatsu began as a communications-equipment venture associated with Seiichi Iwasaki, who had operated Iwasaki Kogyo in Tokyo making and selling cables. In the 1930s, Japanese telephone infrastructure often used railway and power-line routes, creating serious interference and signal-loss problems. Iwasaki recruited engineers Minoru Tokoha and Motosaburo Hashimoto, and later worked with Waseda University researcher Kokichi Hayakawa, to develop specialized anti-induction and anti-tapping telephones. Sales began in October 1937 and quickly exceeded the capacity of the original workshop. Iwasaki incorporated Iwasaki Tsushinki on 14 August 1938 with approximately 50 employees. A new production site at Karasuyama was completed in 1939, by which time the workforce had grown to about 200. During the war years, Iwatsu participated with Hitachi and NEC in the development of a radar-warning system for the Japanese army. Hayakawa led the engineering effort, and Iwatsu's prototype performed best in comparative testing. The company was then required to produce the system in volume. New facilities and headquarters were completed at Kugayama in 1943. Iwatsu also established educational facilities on its premises, reflecting Iwasaki's belief that factory workers and future engineers needed structured training. The postwar period brought both technical opportunity and financial crisis. Iwasaki attempted to move the company toward civilian goods, beginning with common-battery telephones, but shortages, inflation, debt, labor conflict, and job reductions placed the company under severe pressure. On 10 March 1949, Tadashi Adachi became president and Takao Yoshida senior executive vice president. Their restructuring involved asset disposals, property sales, and workforce reductions. The company then benefited from the Allied-backed reconstruction of Japan's communications infrastructure. It improved manufacturing through quality-control methods and conveyor-based production, supplied telephones to the Ministry of Telecommunications, and provided radio accessories to the Defense Agency. The creation of Nippon Telegraph and Telephone Public Corporation in 1952 gave Iwatsu a major institutional customer and helped expand the market for subscriber telephones and key systems. Iwatsu established branch offices around Japan. At the same time, it entered electronic measurement. In cooperation with the Far East Air Material Command at Tachikawa, it developed the Synchroscope, a waveform-holding oscilloscope delivered to the Ministry of Defense in 1954. Its later versions served the needs of television broadcasting and other high-frequency measurement applications. Iwatsu went public in 1953 and joined the First Section of the Tokyo Stock Exchange in 1957. Kanichi Ohashi became president in 1958 after Adachi and Yoshida moved on from active leadership. After studying developments in the United States, Ohashi supported the development of key telephone systems for Japan. A practical five-trunk, ten-station system was delivered to NTT in 1959. Diversification continued in the 1960s. Iwatsu licensed RCA electrophotographic technology and released the ELEFAX PC 301 in 1961 after displaying the earlier PC 201. A technical research laboratory opened in Hachioji in 1964, while telephone production expanded substantially. The company made its first major export of key telephone systems in 1967 after winning a Kuwaiti government tender. It also pursued sales in Southeast Asia, Kenya, the Dominican Republic, Ireland, and other markets, and participated in international trade exhibitions. The short form Iwatsu became the official abbreviation of Iwasaki Tsushinki in 1967. Founder Seiichi Iwasaki died on 25 September 1969. The supplied reference material does not provide enough verified information to describe later decades or current operations in detail.
- 1969
Founder dies
[1]Seiichi Iwasaki died on 25 September 1969.
- 1967
First major key-system export
[1]Iwatsu won a Kuwaiti government tender for key telephone systems and adopted Iwatsu as its official short name.
- 1964
Hachioji technical laboratory completed
[1]Iwatsu expanded its research infrastructure with a technical laboratory in Hachioji, Tokyo.
- 1961
ELEFAX reprographic system released
[1]The company officially released the ELEFAX PC 301 after presenting the PC 201 the previous year.
- 1957
Tokyo Stock Exchange First Section listing
[1]Iwatsu joined the First Section of the Tokyo Stock Exchange.
- 1954
Synchroscope delivered
[1]The first Synchroscope oscilloscope was delivered to Japan's Ministry of Defense.
- 1953
Public listing
[1]Iwatsu became a publicly traded company.
- 1949
Management-led restructuring
[1]Tadashi Adachi and Takao Yoshida were appointed to lead a financial and organizational revival.
- 1944
Radar-warning prototype selected
[1]Iwatsu's prototype won comparative testing among systems developed by three Japanese electronics companies.
- 1943
Kugayama headquarters and factories completed
[1]The company completed a larger headquarters and production complex at Kugayama, Tokyo.
Products and positioning
A specialist Japanese electronics and communications-equipment manufacturer serving telecommunications operators, public-sector organizations, industrial users, broadcasters, and business customers.
Communications equipment · 1937
Anti-induction and anti-tapping telephones
Iwatsu's earliest signature products addressed interference, signal loss, and security problems in Japan's rail, utility, police, mining, and other infrastructure communications. The anti-induction telephone was commercialized in 1937, followed by anti-tapping technology.
Electronic test and measurement · 1954
Synchroscope
The Synchroscope was an oscilloscope developed with the Far East Air Material Command. Its waveform-hold function allowed users to keep a signal visible on the cathode-ray display for observation and measurement. Later versions were adapted to the needs of radar and television engineering.
Reprographic equipment · 1961
ELEFAX PC series
Iwatsu's ELEFAX line represented its move into electrophotographic office equipment. The company licensed technology from RCA, displayed the PC 201 in 1960, and released the PC 301 in 1961.
Business communications · 1959
Key telephone systems
Iwatsu developed practical key telephone systems for business and institutional communications. A five-trunk, ten-station system was delivered to NTT in 1959, and the company later exported key systems to Kuwait and other international markets.
Brand decisions
1960
Diversification into electrophotographic equipmentStrategyBackground
Iwatsu was seeking a major business line beyond telephones and oscilloscopes and concluded that communications expertise could also be applied to information reproduced on paper.
Action taken
The company licensed RCA electrostatic-printing technology and developed the ELEFAX reprographic series.
Aftermath
The PC 201 was presented in 1960 and the PC 301 was released in 1961, giving Iwatsu a third historical product pillar.
1959
Development of a practical key telephone systemProduct launchBackground
After reviewing United States telephone-industry practices, President Kanichi Ohashi regarded key systems as an important next step for Japan's business telephone market.
Action taken
Iwatsu delivered a five-trunk, ten-station key telephone system to NTT Public Corporation.
Aftermath
The system became the basis for later domestic sales and international exports, including the 1967 Kuwaiti tender.
Sources1 sources
Cite this profile: Cite the canonical profile. /brand-wiki/iwatsu-electric · Editorial policy · How profiles are compiled