URI
Notation
681
Caption
Precision mechanisms and instruments
See also
004Computer science and technology. Computing. Data processing
Broader class
68  Industries, crafts and trades for finished or assembled articles
Narrower classes
681.1Apparatus with wheel or motor mechanisms
681.2Instrument-making in general. Instrumentation. Measuring instruments and their manufacture. Balances. Weighing devices
681.5Automatic control technology. Smart technology
681.6Graphic reproduction machines and equipment
681.7Optical apparatus and instruments
681.8Technical acoustics