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Flexible construction in respirator mask facepiece
US 2,706,983 A
Filed
: 09/15/1951
Issued
: 04/26/1955
Est. Priority Date
: 09/15/1951
Status: Expired due to Term
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Current Assignee
James N. Matheson
,
William J. Wiswesser
Original Assignee
James N. Matheson
,
William J. Wiswesser
Inventors
Matheson, James N.
,
Wiswesser, William J.
Application Number
US03/246,806
Time in Patent Office
1,319 Days
Field of Search
US Class Current
128/206.24
CPC Class Codes
A61M 16/0611
with a gusset portion
A62B 18/025
Halfmasks A62B23/02 takes p...
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