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40 Inventive Principles
Extraction

a) Extract, remove or separate the "disturbing" parts or properties from an object.

b) Single out the only necessary part or property.
 

EXAMPLE:
  1. In order to reduce the risk of an unwanted explosion fuses and explosives are always stored separately. The two are only assembled together shortly before being used.
  2. A geostationary communication satellite in orbit carries all of the equipment of a terrestrial television transmitter. There is now no longer the need for a huge tower.