The Canon story begins in 1933. The company's first commercial camera, the legendary "Hansa Canon", which was also Japan's first quality 35mm camera, was released in 1936. Read more about Canon's early days here:
Also, from Zeiss Ikon: Contaflex twin-lens reflex, Nettax rangefinder (built on the Super Nettel platform), Tenax II and the Tenax I.
A piece of trivia about the Tenax cameras. The Tenax II was introduced before the Tenax I -- probably the first time the "II" version of a camera was introduced before the "I." Note that both are marked Tenax.
Regarding Canon's early days, despite being named "Precision Optical Instruments Laboratory," Canon -- bizarrely enough -- couldn't produce its own lenses and used Nikkor lenses.