26 Measuring and Scientific Appliances, Including Instruments for Measuring, Indicating, and Recording Time; Programmers, Timers; Attendance Recorders; Signaling Equipment for Time and Program Control Systems Including Signal Control Racks and Panels; Signal Amplifiers, Signal Transmitters, Signal Receivers, Audible and Visual Signal Indicators and Annunciators; Manual and Automatic Alarm Systems; Job Cost Recorders; Data Communications Systems, Apparatus for Data Communication, Data Transmitters; Data Receivers and Systems, Parts, Subassemblies, and Associated Equipment of the Above