G.M. Co. Manufacturing Inc.

G.M. Co. Manufacturing Inc. company is not, as one would suspect, General Motors, but a manufacturer that made a variety of tools. The company seems to be most “famous” for their 1954 patent for a combination hammer-wrench tool (No.D172,968) more info at

• http://progress-is-fine.blogspot.com/2014/02/vanished-tool-makers-gm-co.html
• https://workingbyhand.wordpress.com/2021/09/11/the-block-planes-of-superheroes-x-gm-co-man/
• http://vintagemachinery.org/mfgindex/detail.aspx?id=3280&tab=0