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US3204474A
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Boom lift
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US3139759A
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Auxiliary transmission for tractors
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Auxiliary transmission for tractor slow drive
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Auger arrangement for trenching machine
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Digging tip
|
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Trench digger blade
|
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Portable trenching device
|
|
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Mobile trenching tool
|
|
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Crawling attachment
|
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Slow speed drive tractor attachment
|
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Hydraulic positioning means for trencher boom
|
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Trencher drive mechanism
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US2748504A
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Trench digging machine
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Trenching machine
|
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Trench digger blade construction
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|
US2519077A
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Trench digging machine
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US2519075A
|
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Drive mechanism for trench digging machines
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