having wipers movable only in one direction for purpose of selection

Patents Grantslast 30 patents

  • Information Patent Grant

    2724747

    • Patent number 2,724,747
    • Issue date Nov 22, 1955
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    2701824

    • Patent number 2,701,824
    • Issue date Feb 8, 1955
    • H01 - BASIC ELECTRIC ELEMENTS