metropolitan museum of art bulletin Arms & armor : from the permanent collection / Helmut Nickel Direct Support Maintenance Repair Parts and Special Tools Lists for Aircraft Nickel Cadmium Batteries, BB-432/A (NSN 6140-00-753-2249), BB-432A/A (NSN 6140-01-072-3125), BB-432B/A (NSN 6140-01-134-2277), BB-433/A (NSN … U.S.A.F. Unit Code Letters / by Roger A. Freeman and George Pennick