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Patent number:
Patent Date:
US Patent: 2,355,916
Relief Valve
Patentee:
Erling Klafstad (
exact
or
similar
names) - Belmont, Middlesex County, MA
USPTO Classifications:
137/471
,
137/477
,
137/535
,
251/296
,
411/513
Tool Categories:
propulsion and energy
:
steam apparatus
:
steam safety valves
Assignees:
None
Manufacturer:
Not known to have been produced
Witnesses:
Unknown
Patent Dates:
Applied:
Dec. 15, 1941
Granted:
Aug. 15, 1944
Patent Pictures:
USPTO
(New site tip)
Google Patents
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