Title:
Demand valve
United States Patent 2854972


Inventors:
Cummins, Richard D.
Application Number:
US54091655A
Publication Date:
10/07/1958
Filing Date:
10/17/1955
Assignee:
FIREWEL DEV COMPANY
Primary Class:
Other Classes:
74/18.1
International Classes:
A61M16/00; A62B9/02
View Patent Images:
US Patent References:
2630129Respiratory device1953-03-03
Foreign References:
GB663202A1951-12-19