1896 Frank Brook founded the Brook Time Check Company, product called "Paragon Time Checker"
1899 Brook Time Check Company wound up.
1901 Frank Brook and a Mr MacMaster took out a patent for a signature recorder
1904 Frank Brook and MacMaster took out a patent for a dial recorder
1907 the firm of Stockall and Sons Ltd. who had some time clock related patents joined with Brook to market time recorders.
1908 Stockall-Book Time Recorders Ltd was incorporated
1911 Improved time recorder put on market
1912 In March Stockall-Book Time Recorders Co. Ltd was wound up and the assets sold to GH Gledhill and Sons Ltd. Gledhill took over the premises and staff and production continued without interruption. F Brooks became a salesman for Gledhill.
1912 In August Gledhills floated a new company, Gledhill-Brook Time Recorders Ltd, selling them the assets bought from Stockall-Brook. Brook became a director of the new company. Now that Gledhills engineering resources (and finance) were available, many months were spent in deciding how to improve the existing clock design which had not been entirely reliable. A clock of high quality was produced.
1914-1918 The factory made Bomb Gear
1920 A new wing was added to the factory as business continued to increase.
1939-1945 War again stopped clock production and the factory was making bomb fuses etc.
1945 Clock production resumed but with difficulties over material supplies. In a paper on Gledhill-Brook Harrison says
"For Gledhills, the numbers of potential Time recorder users increased only at a moderate, regular and predictable rate. The replacement market, which was large, presented an additional opportunity for market growth. Due to Gledhills quality product however the market was not as large as for other Time Recorder manufacturers."
1963 Gledhill-Brook Time Recorders, Ltd ceased trading , and its interests were transferred to GH Gledhill and Sons Ltd who continued to supply the recorder until May 1964
1964 All time recorder interests acquired by the Simplex Time Recorder Co (UK) Ltd.