Hi, All…I have recently acquired a complete set of Zip Chamber and components, including instructions, for .30-40 Krag. I would like to know all I can about the history of the company. We know they were located in San Francisco, CA., with at least two different addresses. I have two patents relating to the chamber and its use, and a 1932 ad from Outdoor Life. I also have a red and blue box containing 50 bullets and 50 blanks. The chamber box states “Patents Pending” and the patents were issued in 1933, so would guess this dates from about 1931-32 ?