Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Movable relative to tool along tool-axis
Patent
1981-06-04
1984-10-02
Bilinsky, Z. R.
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Movable relative to tool along tool-axis
408146, 408204, 408705, 408226, B23B 4514
Patent
active
044745133
ABSTRACT:
Portable handheld device for electricians, plumbers and builders to use to form in one operation perfectly aligned, craftsman-like holes through a soffit and a roof above, or through a ceiling and a roof above, through which aligned holes an electrical conduit, soil stack or vent pipe, chimney pipe, or the like, may be installed.
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patent: 3865502 (1975-02-01), Hamann
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patent: 4076444 (1978-02-01), Siebrecht
Bilinsky Z. R.
Dunn Malcolm G.
Kline Thomas M.
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