philco: Philco 46-1201 M7 turntable patent
This article refers to the model: 46-1201 Code 121 (Philco, Philadelphia Stg. Batt. Co.; USA)
Just FYI, Philco filed a patent on the M7 turntable that is included in the 46-1201. It is US 2,508,715, submitted April 18, 1945, issued on May 23, 1950. It can be downloaded from Google.