Rolf Zurwelle

Person

  • Churchville, MD, US

Patents Grantslast 30 patents

  • Information Patent Grant

    Card file control

    • Patent number 4,015,350
    • Issue date Apr 5, 1977
    • Business Efficiency Aids, Inc.
    • Rolf Zurwelle
    • B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER