Serif wrote:When did Larry J. start designing and when did John J. stop?
John J. died in or about 1950, from what I've read, as the first automatic variable pitch / depth lathe was being developed and on the verge of being introduced; the models thereafter (such as the post-1955 model 601) were designed and its mechanics worked out under Larry J.'s aegis.
The company that developed and made the LS-76 was unrelated to the company that sold 501's, 601's and everywhere in-between as well as (in the case of the 501) before. The LS-76's manufacturer was the L.J. Scully Manufacturing Corp.; the prior company, Scully Recording Instruments Corp., was by then part of Dictaphone and its manufacturing base long moved to California (and also pretty much making only tape machines).