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Electronic pitching aid

  • US 3,229,975 A
  • Filed: 08/16/1962
  • Issued: 01/18/1966
  • Est. Priority Date: 08/16/1962
  • Status: Expired due to Term
First Claim
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2. AN ELECTRONIC PITCHING AID WHICH COMPRISES:

  • PHOTOELECTRIC MEANS FOR GENERATING A PLANAR MATRIX OF LIGHT MEANS AND PROVIDING A SIGNAL INDICATING THE LOCATION IN WHICH AN OBJECT PASSES HOME PLATE, SAID SIGNAL HAVING A DURATION PROPORTIONAL TO THE TIME SAID OBJECT INTERRUPTS SAID BEAMS, MEANS FOR PASSING ONLY THOSE OF SAID SIGNALS HAVING LESS THAN A PRESELECTED DURATION, AND MEANS FOR SWITCHING ON A LIGHT INDICATING SAID LOCATION IN RESPONSE TO A PASSED SIGNAL.

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