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1. Physics  (67)
2. Measuring  (60)
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4. Measuring Force, Stress, Torque, Work, Mechanical Power,mechanical Efficiency, Or Fluid Pressure  (46)
5. Electricity  (39)
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8. Electric Solid State Devices Not Otherwise Provided For  (25)
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10. Loudspeakers, Microphones, Gramophone Pick-Ups Or Likeacoustic Electromechanical Transducers  (16)
11. Electric Communication Technique  (16)
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13. Investigating Or Analysing Materials By Determining Theirchemical Or Physical Properties  (12)
14. Calculating  (8)
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18. Measurement Of Mechanical Vibrations Or Ultrasonic, Sonic Orinfrasonic Waves  (5)
19. Detecting Masses Or Objects  (4)
20. Geophysics  (4)
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Language 

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