Colored gas signal
United States Patent 2398545

Inventors:
Macmillan, Douglas M.
John, Vinton
Paiva, Albert C.
Publication Date:
04/16/1946
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Assignee:
Vinton
Primary Class:
102/334
Other Classes:
441/19, 102/356, 102/336
International Classes:
F42B4/26; F42B4/00