Gledhill-Brook Time Recorders Ltd


Here is a list of serial numbers to accurately date all Gledhill-Brook time recorders from January 1918, taken from HARRISON P (1991) A Series of Papers on the Early History and Development of Industrial Time Recorders - Paper 1 - Gledhill-Brook Time Recorder Co. Ltd, England, 1912-1964:

Gledhill-Brook Date Sheet