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US2187092A
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Apparatus for drilling wells
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US2146645A
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Foundation construction
|
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US2055876A
|
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Tunneling
|
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US2031279A
|
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Excavating machine
|
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US2041013A
|
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Method of excavating material and machine therefor
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US2140111A
|
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Method and apparatus for forming concrete foundation columns
|
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US1954094A
|
|
Foundation construction
|
|
US1928947A
|
|
Well drilling apparatus
|
|
US1943835A
|
|
Drilling apparatus
|
|
US1909980A
|
|
Method of making a retaining wall
|
|
US1907654A
|
|
Foundation construction
|
|
US1826087A
|
|
Apparatus for drilling wells
|
|
US1848192A
|
|
Drilling apparatus
|
|
US1763810A
|
|
Excavating machine
|
|
US1538947A
|
|
Excavating apparatus
|
|
US1531212A
|
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End gate for dump trucks
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US1347967A
|
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Bucket-latch for shovels
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US1289880A
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Float for autotrucks.
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US1262238A
|
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Dump-wagon.
|
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US1203037A
|
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Scraper or like device and means for manipulating the same.
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