Scientific, nautical, surveying, electric, electronic, weighing, measuring, signalling and checking (supervision) apparatus and instruments; apparatus and instruments for (a) the generation, amplification, transmission, monitoring, analysis, measurement, control and reception of electric, electronic, and acoustic signals, and of sound and images; (b) the transmission and control of cable programming; (c) the measurement, prevention and control of utility overloads; (d) the detection, measurement and identification of underwater acoustic sound sources; (e) the digitizing, compressing, storing and retrieval of analog sound and light sources; (f) the monitoring of noise and vibration in transportation equipment; and (g) the storage and retrieval of electronically encoded data; earth stations for the reception, processing and re-transmission of signals from satellites; home communication terminals for the reception of control of cable signals