Reference : MM-1-18-288

Name of creator(s) : Michael Moerman

Scope and content : November 9, 1960. There were three kinds of tapping signals to call a meeting: 1) tapping from slow to fast to call a general meeting. 2) Tapping fast consecutively for the notification of a bandit. 3) Consecutive tapping very quickly for notification of a fire.

Extent and medium : Punch card