US PATENT SUBCLASS 104 / 11
.~.~ Pneumatic injector

Current as of: June, 1999
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104 /   HD   RAILWAYS

2  DF  TRACK LAYERS {11}
10  DF  .~ Tamper {3}
11.~.~ Pneumatic injector

DEFINITION

Classification: 104/11

(under subclass 10) Pneumatic injection apparatus for forcing cement or concrete beneath and around ties.