Security guard recording system

US3959633A · kind A · utility

Assignee

• MERCK & CO., INC. · US

Inventors

• William Lawrence · Four Corners, US
• Wolfgang Sauter · Renquishausen, DE

Key dates

• Filing date: Sep 10, 1974
• Grant date: May 25, 1976
• Expiry date: Sep 10, 1994

Classification

• Technology area (CPC G): Physics
• CPC primary: G07C1/20
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A watchman's tour recording system which includes a watchman's unit having a clock means for producing digital time signals, a station identification signal producing means for producing digital station signals, at least two digital bit storage or memory means and special address means arranged to direct the digital time and station identification signals into predetermined locations in the memory means so that their storage capabilities are most effectively utilized. Novel photoelectric station identification signal generating means are also disclosed.