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US 2,576,253 A
Filed
: 03/11/1946
Issued
: 11/27/1951
Est. Priority Date
: 03/11/1946
Status: Expired due to Term
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Current Assignee
James K. Farrell
,
Paul A. Keene
Original Assignee
James K. Farrell
,
Paul A. Keene
Inventors
Farrell, James K.
,
Keene, Paul A.
Application Number
US02/653,475
Time in Patent Office
2,087 Days
Field of Search
US Class Current
137/93
CPC Class Codes
G05D 21/02
characterised by the use of...
Y10T 137/2509
By optical or chemical prop...
Y10T 137/4891
With holder for solid, flak...
Y10T 137/86228
With communicating opening ...
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