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United States Patent 1509601

Inventors:
Johnson, Harry W.
Johnson, Arthur F.
Fredolph, Johnson
Johnson, Charles V.
Publication Date:
09/23/1924
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Assignee:
Johnson, Harry W.
Johnson, Arthur F.
Fredolph, Johnson
Johnson, Charles V.
Primary Class:
416/206
International Classes:
F01P7/06; F01P7/00