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- CHECKING-DEVICES (12)
- COMPUTING; CALCULATING; COUNTING (863)
- CONTROLLING; REGULATING (64)
- EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS (96)
- HOROLOGY (2)
- INFORMATION STORAGE (204)
- MEASURING; TESTING (257)
- MUSICAL INSTRUMENTS; ACOUSTICS (30)
- NUCLEAR PHYSICS; NUCLEAR ENGINEERING (13)
- OPTICS (139)
- PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY (94)
- SIGNALLING (61)