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Polyurethane foam exercise device for upper body development

  • US 5,145,473 A
  • Filed: 10/30/1991
  • Issued: 09/08/1992
  • Est. Priority Date: 03/23/1990
  • Status: Expired due to Fees
First Claim
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1. A muscle exerciser comprising:

  • a ball having an outside surface and an inner hollow cavity;

    a spring operated switch having a single push rod wherein said spring operated switch is positioned within said cavity, said push rod extending into said cavity;

    a switch receptacle positioned within said cavity, whereby when said ball is compressed, the push rod contacts said receptacle.

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