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In the Wheatstone ledger covering the years 1923 to 1937 there are five columns which show(from page left to right) Date, Model number, Description, Job Number and Serial number. That is untill page 127 when a sixth column appears for the first time. This Sixth column is inserted between the Description and the Job Number and contains just one letter; either an O , an R or an M. Does anybody know what this means ? It is probably obvious what this implies but I have not worked it out yet. Geoff.
