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Machines for making slits approximately perpendicular to the seams either level with, or above or below the level of, the machine
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Industry
CPC
E21C25/62
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21C
MINING OR QUARRYING
E21C25/00
Cutting machines
Current Industry
E21C25/62
Machines for making slits approximately perpendicular to the seams either level with, or above or below the level of, the machine
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Patents Grants
last 30 patents
Information
Patent Grant
2710180
Patent number
2,710,180
Issue date
Jun 7, 1955
E21 - EARTH DRILLING MINING
Information
Patent Grant
2336487
Patent number
2,336,487
Issue date
Dec 14, 1943
E21 - EARTH DRILLING MINING
Information
Patent Grant
2065809
Patent number
2,065,809
Issue date
Dec 29, 1936
E21 - EARTH DRILLING MINING
Information
Patent Grant
1980135
Patent number
1,980,135
Issue date
Nov 6, 1934
E21 - EARTH DRILLING MINING
Information
Patent Grant
1890187
Patent number
1,890,187
Issue date
Dec 6, 1932
E21 - EARTH DRILLING MINING
Information
Patent Grant
1679130
Patent number
1,679,130
Issue date
Jul 31, 1928
E21 - EARTH DRILLING MINING
Information
Patent Grant
1679136
Patent number
1,679,136
Issue date
Jul 31, 1928
E21 - EARTH DRILLING MINING
Information
Patent Grant
1679127
Patent number
1,679,127
Issue date
Jul 31, 1928
E21 - EARTH DRILLING MINING
Information
Patent Grant
1661630
Patent number
1,661,630
Issue date
Mar 6, 1928
E21 - EARTH DRILLING MINING
Information
Patent Grant
1654218
Patent number
1,654,218
Issue date
Dec 27, 1927
E21 - EARTH DRILLING MINING
Information
Patent Grant
1647885
Patent number
1,647,885
Issue date
Nov 1, 1927
E21 - EARTH DRILLING MINING
Information
Patent Grant
1643665
Patent number
1,643,665
Issue date
Sep 27, 1927
E21 - EARTH DRILLING MINING
Information
Patent Grant
1635623
Patent number
1,635,623
Issue date
Jul 12, 1927
E21 - EARTH DRILLING MINING
Information
Patent Grant
1614035
Patent number
1,614,035
Issue date
Jan 11, 1927
E21 - EARTH DRILLING MINING
Information
Patent Grant
1614034
Patent number
1,614,034
Issue date
Jan 11, 1927
E21 - EARTH DRILLING MINING
Information
Patent Grant
1554606
Patent number
1,554,606
Issue date
Sep 22, 1925
E21 - EARTH DRILLING MINING
Information
Patent Grant
1537084
Patent number
1,537,084
Issue date
May 12, 1925
E21 - EARTH DRILLING MINING
Information
Patent Grant
1520995
Patent number
1,520,995
Issue date
Dec 30, 1924
E21 - EARTH DRILLING MINING
Information
Patent Grant
1521036
Patent number
1,521,036
Issue date
Dec 30, 1924
E21 - EARTH DRILLING MINING
Information
Patent Grant
1519740
Patent number
1,519,740
Issue date
Dec 16, 1924
E21 - EARTH DRILLING MINING
Information
Patent Grant
1518125
Patent number
1,518,125
Issue date
Dec 2, 1924
E21 - EARTH DRILLING MINING
Information
Patent Grant
1509080
Patent number
1,509,080
Issue date
Sep 16, 1924
E21 - EARTH DRILLING MINING
Information
Patent Grant
1422386
Patent number
1,422,386
Issue date
Jul 11, 1922
E21 - EARTH DRILLING MINING
Information
Patent Grant
1332689
Patent number
1,332,689
Issue date
Mar 2, 1920
E21 - EARTH DRILLING MINING
Information
Patent Grant
1310248
Patent number
1,310,248
Issue date
Jul 15, 1919
E21 - EARTH DRILLING MINING
Information
Patent Grant
1304524
Patent number
1,304,524
Issue date
May 20, 1919
E21 - EARTH DRILLING MINING
Information
Patent Grant
1275156
Patent number
1,275,156
Issue date
Aug 6, 1918
E21 - EARTH DRILLING MINING
Information
Patent Grant
1269296
Patent number
1,269,296
Issue date
Jun 11, 1918
E21 - EARTH DRILLING MINING
Information
Patent Grant
1269298
Patent number
1,269,298
Issue date
Jun 11, 1918
E21 - EARTH DRILLING MINING
Information
Patent Grant
1269295
Patent number
1,269,295
Issue date
Jun 11, 1918
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents