Navigational Instruments 6605
Flight Instruments 6610
Automatic Pilot Mechanisms and Airborne Gyro Components 6615
Engine Instruments 6620
Electrical and Electronic Properties Measuring and Testing Instruments 6625
- 1-100
- 101-200
- 201-300
- 301-400
- 401-500
- 501-600
- 601-700
- 701-800
- 801-900
- 901-1000
- 1001-1100
- 1101-1200
- 1201-1300
- 1301-1400
- 1401-1500
- 1501-1600
- 1601-1700
- 1701-1800
- 1801-1900
- 1901-2000
- 2001-2100
- 2101-2200
- 2201-2300
- 2301-2400
- 2401-2500
- 2501-2600
- 2601-2700
- 2701-2800
- 2801-2900
- 2901-3000
Chemical Analysis Instruments 6630
Physical Properties Testing and Inspection 6635
Environmental Chambers and Related Equipment 6636
Laboratory Equipment and Supplies 6640
Time Measuring Instruments 6645
Optical Instruments, Test Equipment, Components and Accessories 6650
Geophysical Instruments 6655
Meteorological Instruments and Apparatus 6660
Hazard-Detecting Instruments and Apparatus 6665
Scales and Balances 6670
Drafting, Surveying, and Mapping Instruments 6675
Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments 6680
Pressure, Temperature, and Humidity Measuring and Controlling Instruments 6685
- 1-100
- 101-200
- 201-300
- 301-400
- 401-500
- 501-600
- 601-700
- 701-800
- 801-900
- 901-1000
- 1001-1100
- 1101-1200
- 1201-1300