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Creation Date 

1. Before 2013  (4)
2. 2013 To 2014  (9)
3. 2015 To 2016  (18)
4. 2017 To 2019  (21)
5. After 2019  (9)
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Subject 

1. Measuring Force, Stress, Torque, Work, Mechanical Power,mechanical Efficiency, Or Fluid Pressure  (47)
2. Electricity  (39)
3. Semiconductor Devices  (26)
4. Basic Electric Elements  (26)
5. Electric Solid State Devices Not Otherwise Provided For  (26)
6. Public Address Systems  (15)
7. Loudspeakers, Microphones, Gramophone Pick-Ups Or Likeacoustic Electromechanical Transducers  (15)
8. Electric Communication Technique  (15)
9. Deaf-Aid Sets  (15)
10. Investigating Or Analysing Materials By Determining Theirchemical Or Physical Properties  (12)
11. Measurement Of Mechanical Vibrations Or Ultrasonic, Sonic Orinfrasonic Waves  (5)
12. Performing Operations  (4)
13. Detecting Masses Or Objects  (4)
14. Microstructural Devices Or Systems, E.G. Micromechanicaldevices  (4)
15. Gravitational Measurements  (4)
16. Microstructural Technology  (4)
17. Geophysics  (4)
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Language 

1. French  (23)
2. Japanese  (16)
3. German  (14)
4. Chinese  (4)
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