Rein may not have been the chief designer of the amps, but surely had a hand in them.
https://en.wikipedia.org/wiki/Fairchild_Recording_Equipment_Corporation
https://museumofmagneticsoundrecording.org/ManufacturersFairchild.html
https://www.aes.org/aeshc/jaes.obit/JAES_V67_11_PG931.pdf