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Respirator mask
US 2,578,621 A
Filed
: 12/29/1945
Issued
: 12/11/1951
Est. Priority Date
: 12/29/1945
Status: Expired due to Term
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Current Assignee
William P. Yant
Original Assignee
William P. Yant
Inventors
Yant, William P.
Application Number
US02/637,822
Time in Patent Office
2,173 Days
Field of Search
US Class Current
128/206.24
CPC Class Codes
A62B 18/025
Halfmasks A62B23/02 takes p...
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