>Tough to find info on Glantz mfg co. . They were around in the 40's I think.
Glantz Manufacturing Co. ,Minden, Neb appears in the defence hearings records just before the war, they state they make "motor maintenance tools"
Owner L. B. Glantz
That name gets me the inventor of an unassigned patent similar to your Valve Lifter, 1,932,728 , issued 1933
There is also a patent for a piston ring compressor (1,805,543) of which an example appears on Bolts site. There it is mentioned that similar tool was marked
Grayson Tool Co. of Hastings Nebraska
In the late 40's they also dabbled with drill press attachments...
Stray 1960's ad hits lead me to believe they decided to make survey equipment later on...
None in datamp...
01149255 1915-08-10 Sharpening attachment for ensilage-cutters.
01711937 1929-05-07 Internal-combustion engine.
01805543 1931-05-19 Piston ring compressor
01932728 1933-10-31 Valve lifter
02526553 1950-10-17 Drill clamp