Archived - Standard Industrial Classification - Establishments (SIC-E) 1980
- E - Manufacturing Industries
- 39 - Other Manufacturing Industries
- 391 - Scientific and Professional Equipment Industries
- 3911 - Indicating, Recording and Controlling InstrumentsIndustry
- 3912 - Other Instruments and Related Products Industry
- 3913 - Clock and Watch Industry
- 3914 - Ophthalmic Goods Industry
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