David A. Spence

Person

  • Milwaukee, WI, US

Patents Grantslast 30 patents

  • Information Patent Grant

    Releasable locking device

    • Patent number 5,297,921
    • Issue date Mar 29, 1994
    • Rite-Hite Corporation
    • Scott L. Springer
    • B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL