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Patent US 3633120A: Difference between revisions
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|Filing date=1970-09-16 | |Filing date=1970-09-16 | ||
|Grant date=1972-01-04 | |Grant date=1972-01-04 | ||
|Links=Ft doubler | |||
}} | }} | ||
→ [http://w140.com/US3633120.pdf PDF version] | → [http://w140.com/US3633120.pdf PDF version] | ||