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TRIZ 40 Principles

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20. Continuity of useful action

Not all parts of all machines are being optimally used all of the time. We can thus improve matters by reducing this idle time or putting it to better use. For example a reciprocating saw has a dead time at the end of each stroke which is eliminated by the circular saw. An alternative may be to put the reciprocation to good use, such as actuating a pump which removes the sawdust.