More information needed.
You will have to tell who made it.
J. Stevens Arms Company
The JStevens Arms Company Model 235 double-barrel shotgun was made from 1912 to 1932. However, there were no guns made by the company from 1916 until 1920.
Belgium
Email us exactly how your shotgun is marked. gunshop@nctv.com
The 12 Gauge Single Shot Shotgun Model 336882 from the Volunteer Arms Company was probably manufactured by the Belknap Hardware and Manufacturing Company that operated in Louisville, Kentucky. Iver Johnson Company and H & R, are two other gun manufacturers that made this type of shotgun.
Probably Mossberg
J. Stevens for Sears Roebuck.
Stevens
It seems most Revelation Shotguns were made by Steven/Savage company.
The Western Field shotgun was sold by Montgomery Ward and made by Mossberg. Made around 1964. I inherited one that is in mint condition and still fires. It is a 410 single barrel 150c shotgun.
IF ALL applicable CODES, and normally acceptable safety practices, are STRICTLY adhered to, then the answer is YES, LPG is safe to use in an industrial "company," or application.