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JPS62125199A
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Ground drilling apparatus
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JPS61250296A
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Underground excavation method and underground excavator
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JPS61250297A
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Underground excavation method and underground excavator
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JPS60141988A
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Bucket type driller
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JPS60126491A
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Ground drilling method
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JPS60126490A
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Packet type drill
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JPS56153095A
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Underground drilling
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JPS56153094A
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Underground drilling rotary excavating cutter
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JPS56153096A
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Underground drilling
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JPS5452810A
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Method of measuring accuracy of excavation of rotational or irrotational propulsive pipe
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JPS5452811A
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Method of measuring accuracy of propulsion of rotational or irrotational propulsive pipe
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JPS5452569A
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Device for vertically supporting marker light pole
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JPS53144118A
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Doubleeacting sliding jack for excavation
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JPS53140815A
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Method of drilling underground hole to bury building
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JPS53132405A
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Cycloid excavation device
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JPS53129101A
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Eccentric excavation device
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JPS53125313A
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Method of drilling underground hole to bury building
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JPS535813A
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Earth drilling apparatus
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