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United States Patent 3487646

Inventors:
Gatien, Paul Henri
Publication Date:
01/06/1970
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Assignee:
Gatien, Paul Henri
Primary Class:
Other Classes:
405/249
International Classes:
E02D5/30; E02D5/60; E02D5/22; E02D5/24; E02D5/30; E02D5/38; E02D5/52




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