Drilldown: Patents
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Patents > Office
:
??
or
US
& National tech categories
:
AT 77d
or
USPC 244/3.23
or
USPC 244/30
or
USPC 244/80
& Cites these patents
:
1910
or
Patent AT-1909-47911
or
USPC 244/87
or
None
& Citations from after 1930:
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Alvis F. Croom (1) ·
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