| http://www.w3.org/ns/prov#value | - t, the device including interconnected locking plates which overlie...http://www.google.com/patents/US3770298?utm_source=gb-gplus-sharePatent US3770298 - Trailer hitch anti-breakway deviceAdvanced Patent SearchPublication numberUS3770298 APublication typeGrantPublication dateNov 6, 1973Filing dateJun 23, 1971Priority dateJun 23, 1971Publication numberUS 3770298 A, US 3770298A, US-A-3770298, US3770
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