US Patent 390,528 · 2 Oct 1888

Permutation lock with combination changer

by Thomas S. Spivey, Cincinnati, Ohio

Patent drawing of a permutation lock with a perforated driving disk, tumblers and sections
Hover to magnify · click for full screen
Thomas S. Spivey's permutation lock, US patent 390,528 of 1888, sheet 1. Public domain, via Google Patents.

DownloadSave to Pinterest

Around the same time

1876 Time attachment for locks

1877 Twin-movement time lock

1890 Drill-proof plate behind the lock

1891 Time lock

1894 Seamless welded safe body

1899 Screw-door safe

← 1877 Twin-movement time lock All patents 1890 Drill-proof plate behind the lock →