6605

Navigational Instruments

18

6610

Flight Instruments

2

6615

Automatic Pilot Mechanisms & Airborne Gym Components

3

6620

Engine Instruments

31

6625

Electrical & Electronic Properties

100

6630

Chemical Analysis Instruments

5

6635

Physical Properties Testing & Inspection

4

6636

Envromental Chambers & RelatedEquipment

0

6640

Laboratory Equipment & Supplies

9

6645

Time Measuring Instruments

325

6650

Optical Instnrments, Test Equipment

75

6655

Geophysical Instniments

0

6660

Meteomiogical Instruments & Apparatus

2

6665

Hazard-Detecting Instniments & Apparatus

40

6670

Scales & Balances

1

6675

Drafting, Surveying, & Mapping Instruments

9

6680

Liquid & Gas Flow, Liquid Level, & Mechanical Motion Measuring Instruments

249

6685

Pressure, Temperature, & Humidity Measuring & Continuing Instruments

151

6695

Combination & Miscellaneous Instruments

25