Larry Fishman etablished the Fishman company in 1981 - to produce acoustic guitar pickups. He soon had orders from Martin and began to branch out into pickups for other acoustic stringed instrument. From the early 1980s Fishman also made amplifiers and other guitar related products. Fishman also provide OEM parts to many other guitar makers - particularly transducers and preamps tor acoustic guitars.

Source: Fishman website (14 February 2022)