URI
Notation
621.7
Caption
Mechanical technology in general: processes, tools, machines, equipment
Including
Tool making. Forging. Foundry work. Smelting. Plastic forming (of metals). Welding. Packing and packaging equipment
Application Note
For details of machinery and processes use special auxiliary numbers 62-1/-9
See also
621.9Working or machining with chip formation. Abrasive working. Hammers and presses
658.2Installations and plant. Premises. Buildings, works, factories. Materials
658.5Production engineering and planning. Design. Production management and control
Broader class
621  Mechanical engineering in general. Nuclear technology. Electrical engineering. Machinery