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http://www.google.com.au/patents/US2093045?utm_source=gb-gplus-share
Patent US2093045 - BIT AND CORE BREAKER
BIT AND CORE BREAKER
O. HAMMER et al
› Overview
Abstract
Drawings
Description
Claims
Patent number
: 2093045
Filing date
: 17 Sep 1934
Issue date
: 14 Sep 1937
Inventors
:
O. HAMMER
,
O. HAMMER
Current U.S. Classification
:
175/404
;
175/406
;
175/421
;
D15/21
View patent at USPTO
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Referenced by
Citing Patent
Filing date
Issue date
Original Assignee
Title
US5265685
30 Dec 1991
30 Nov 1993
Dresser Industries, Inc.
Drill bit with improved insert cutter pattern
US5346025
9 Sep 1993
13 Sep 1994
Dresser Industries, Inc.
Drill bit with improved insert cutter pattern and method of drilling
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