Title:
Mask
United States Patent 1632449


Inventors:
Mckessson, Elmer I.
Application Number:
US72647624A
Publication Date:
06/14/1927
Filing Date:
07/17/1924
Assignee:
Mckessson, Elmer I.
Primary Class:
Other Classes:
128/207.13
International Classes:
A62B18/02
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