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Patent number:
Patent Date:
US Patent: 1,490,223
Indicator
Patentee:
Thomas Midgley, Jr. (
exact
or
similar
names) - Dayton, Montgomery County, OH
USPTO Classifications:
346/107.1
,
346/4
,
73/114.18
Tool Categories:
industrial tools
:
pressure indicators
propulsion and energy
:
internal combustion engines
:
internal combustion engine indicators
Assignees:
General Motors Research Corp.
- Dayton, Montgomery County, OH
Manufacturer:
Not known to have been produced
Witnesses:
Unknown
Patent Dates:
Applied:
Apr. 01, 1920
Granted:
Apr. 15, 1924
Patent Pictures:
USPTO
(New site tip)
Google Patents
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