Newly Printed Item: by Ian Skennerton . The Complete Reference Guide to Weapons, Maker?s Codes & 1936-1946 Contracts. Hard cover w/ dust jacket, 9_ x 6 in., 110 pages, 36 illustrations, 1988. ISBN 0 949749 09 5. These WW2 manufacturers? codes and contract details are an invaluable reference for the serious researcher and collector, extracted from original Ministry of Supply handwritten ledgers.