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PCE
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CPC Subgroup
E21B 1/16

with spring-mounted reciprocating masses, e.g. with air cushion

Full Title

Percussion drilling > with a reciprocating impulse member (E21B1/02, E21B1/38 take precedence) > driven by a rotating mechanism > with spring-mounted reciprocating masses, e.g. with air cushion

1 direct subcode

Child Classifications

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  • E21B 1/18 with elastic joining of the drive to the push-rod by double buffer springs