Links & References

Information Sources:

Dr Paul Harrison: 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

The National Archives, Companies House, Grace's Guide, Stanley Security Products, Llewellin's Machine Company Ltd, IBM, Wikipedia, Barrie Smith, Google Patents, espacenet.com

And a special thanks to John Fothergill for his help, advice, and endless knowledge regarding time recorders.

Useful Links:

IBM History: http://www-03.ibm.com/ibm/history/index.html

IBM Hursley Park Museum: http://slx-online.biz/hursley/

The Bundy Museum: http://www.bundymuseum.org/

Antique Time Clocks: http://www.antiquetimeclocks.com/

Gledhill-Brook info: http://gledhillbrook.com/

English Clock Systems: http://www.englishclocksystems.co.uk/index.htm

Electrical Clock Information: http://www.electric-clocks.org.uk/