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John Moy's book, 'The Use of the 1894 Coded Time System in English Provincial Offices' explains how to decode the times. In essence the letters A to M (excluding J) were used to indicate the hour followed by the letters A to L (excluding J) to indicate the 5 minute intervals from .05 to .55. The single or double letters were followed by a symbol and then by A for a.m. or P for p.m. The system may be decoded by reference to the following chart:
For example EH x P represents 5.40 p.m. (This method is derived from the Telegraphic time codes which also used additional letters to indicate one to four minutes after the 5 minute interval to provide timing down to the nearest minute.) 'E' represents 5.00.
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