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DE Patent: DE-356,319
Zuendkerzenprüfer
Patentee:
Georg Michael Humpfner (exact or similar names) - Wurzburg, Germany

USPTO Classifications:

Tool Categories:
wrenches : wrench combination tools

Assignees:
None

Manufacturer:
Unknown

Witnesses:
none listed

Patent Dates:
Granted: Jul. 20, 1922
Antedated: May 11, 1921

Patent Pictures:
G. M. Humpfner patent July 20, 1922 (edited drawing)
Espacenet patent
Report data errors or omissions to steward Stan Schulz
DE356319 in ESPACENET
Description:
Spark plug tester which folds into the handle of an open end wrench; together with the gapped electrode in DE-363527 produced as a tool marketed in the U.S. as the C.T.H. Plug Tester wrench. (see 1922 description appended to DATAMP entry for DE-363527.

German ads for the tool note "foreign patents."

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