Patent US3121565 - BOWLING PIN HAVING A MAGNETIC ELEMENT MOUNTED

Patents

Inventors: Everett K. Mentzer, Everett K. Mentzer
Current U.S. Classification: 473/123; 335/302; 446/130; 473/64

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Citing Patent	Filing date	Issue date	Original Assignee	Title
US4008432	26 Dec 1973	15 Feb 1977	TDK Electronics Company, Limited	Apparatus for detecting an external magnetic field
US4221062	8 Jan 1979	9 Sep 1980		Apparatus for demonstrating transmission of nerve impulses