Democratic Sentinel, Volume 16, Number 45, Rensselaer, Jasper County, 25 November 1892 — Business Lock. [ARTICLE]

Business Lock.

An ingenious lock has been devised for use in business houses and offices where absolute privacy is desired. By simply turning an electricswitch, placed close at hand, the occupant of the room may Instantly admit a person, as quickly lock the door on his egress, without leaving his chair.