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40 Inventive Principles
Self-service

a) Make the object service itself and carry out supplementary and repair operations.

b) Make use of wasted resources or energy.
 

EXAMPLE:
  1. To investigate the effect of aggressive liquids upon different alloys, containers are made out of the alloys to be tested.
  2. In electric welding, the welding-rod is usually fed through a special feeding device, in which one of the magnetic spools is controlled by the welding current.