38,481
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Patent US 3426311A: Difference between revisions
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|Filing date=1966-06-16 | |Filing date=1966-06-16 | ||
|Grant date=1969-02-04 | |Grant date=1969-02-04 | ||
|Links=7M11;3T7; | |Links=7M11;3T7;035-5031-00; | ||
}} | }} | ||