Here is more on the Victor Animatograph Corporation, which introduced its first 16mm movie camera and projector in 1923.
Here is an advertisement Victor ran in Popular Photography in October 1944, when the company’s production went almost entirely to military contracts. It reproduces the company’s first newspaper advertisement from 1923-08-12.
Here is a post from 2022-12-26 on the operation of “Optical Sound on Film for Motion Pictures”.