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Subject 

1. Physics  (27)
2. Measuring  (23)
3. Testing  (23)
4. Electricity  (22)
5. Measuring Force, Stress, Torque, Work, Mechanical Power,mechanical Efficiency, Or Fluid Pressure  (20)
6. Semiconductor Devices  (16)
7. Basic Electric Elements  (16)
8. Electric Solid State Devices Not Otherwise Provided For  (16)
9. Public Address Systems  (7)
10. Loudspeakers, Microphones, Gramophone Pick-Ups Or Likeacoustic Electromechanical Transducers  (7)
11. Electric Communication Technique  (7)
12. Deaf-Aid Sets  (7)
13. Calculating  (4)
14. Electric Digital Data Processing  (4)
15. Investigating Or Analysing Materials By Determining Theirchemical Or Physical Properties  (4)
16. Computing  (4)
17. Counting  (4)
18. Measurement Of Mechanical Vibrations Or Ultrasonic, Sonic Orinfrasonic Waves  (2)
19. Detecting Masses Or Objects  (1)
20. Geophysics  (1)
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Language 

1. English  (26)
2. German  (15)
3. Japanese  (9)
4. Korean  (1)
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