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US Patent: 738,826
Self-adjusting plunger
Patentee:
Charles F. Marsh - Elgin, IL

USPTO Classifications:
81/6

Tool Categories:
trade specific : watchmaker

Assignees:
None

Manufacturer:
Hardinge Bros. - Chicago, IL

Witnesses:
Thomas J. Juzek
A. H. Ruegnitz

Patent Dates:
Applied: May 04, 1903
Granted: Sep. 15, 1903

Patent Pictures: [ 1 | 2 | 3 | 4 | 5 ]
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"Vintage Machinery" entry for Hardinge Bros.
Description:
This device is used to hold a watch movement while pressing the hands into position on the center staff. The staff is supported so that pressure is not placed on the jewel bearing while the hands are being pressed on. An example has been reported, labeled on the outside "HARDINGE BROS. MFGRS. CHICAGO U.S.A." The inside is labeled PAT. SEP 15 '03. / CHAS. MARSH ELGIN, ILL."

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