Screw-Thread Cutting by the Master-Screw Method since 1480
By: Edwin A. BattisonDirectness and simplicity characterize pioneer machine tools because
they were intended to accomplish some quite specialized task and the
need for versatility was not apparent. History does not reveal the
earliest forms of any primitive machines nor does it reveal much about
the various early stages in evolution toward more complex types. At best
we have discovered and dated certain developments as existing in
particular areas.
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