MAGNETIC TAPE TRANSPORTS AND MAGNETIC DATA STORAGE UNITS, AND PARTS THEREFOR; DIGITAL TAPE RECORDERS AND REPRODUCERS, AND PARTS THEREFOR; AND TIMING DEVICES OF ELECTROMECHANICAL, ELECTRONIC AND PNEUMATIC TYPES-NAMELY, INTERVAL TIMERS, CYCLE TIMERS, PROGRAM TIMERS, CONTROL TIMERS, DELAY TIMERS, ELAPSED TIME INDICATORS AND TIME TOTALIZERS