US PATENT SUBCLASS 144 / 78
.~ Hollow chisel and bit

Current as of: June, 1999
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144 /   HD   WOODWORKING

75  DF  MORTISING MACHINE HAVING CHISEL {5}
78.~ Hollow chisel and bit {1}
79  DF  .~.~> Portable

DEFINITION

Classification: 144/78

Hollow chisel and bit:

(under subclass 75) Mortising-machine having a hollow square chisel with a boring-bit operating inside thereof.