Master Clocks and Time Distribution Mitchell Janoff

 

Henry Warren Biograph

Telechron Type A Master Clock NAWCC Bulletin Article

Telechron Type B Master Clock Instruction Book

Modern Electric Clocks, A Paper read by Henry Warren Feb 6, 1937

Central Station Electrical World February 1926

Warren Telechron Presentation

Synchronous Clock Patent 1283431

Warren Master Clock 1502493