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Patent US 3641555A: Difference between revisions
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|Filing date=1968-12-09 | |Filing date=1968-12-09 | ||
|Grant date=1972-02-08 | |Grant date=1972-02-08 | ||
|Cites=Patent US 3214631A;Patent US 3426237A;Patent US 3426236A;Patent US 3430093A; | |||
}} | }} | ||