Measuring, counting, calibrating, testing or regulating apparatus

Child Classifications

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• G04D 7/001
• G04D 7/002
• G04D 7/004
• G04D 7/005
• G04D 7/006
• G04D 7/02 for mainsprings
• G04D 7/04 for gearwork,
• G04D 7/06 for escapements
• G04D 7/08 for balance wheels
• G04D 7/10 for hairsprings
• G04D 7/12 Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard