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ES388525A1
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Improvements in the vibratory mechanical systems to work geological formations. (Machine-translation by Google Translate, not legally binding)
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ES383135A1
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Improvements in vibratory mechanical systems. (Machine-translation by Google Translate, not legally binding)
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US3613383A
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Tunneling shield with breasting doors
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US3640077A
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Shield tunneling method
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US3581500A
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Fluid pulse generators
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US3554604A
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Vibrator systems and rock cutter type utilization mechanisms
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US3653716A
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Roller butter rock boring apparatus and method
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US3554298A
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Breakout apparatus for a sectional drill stem
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US3544075A
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Vibrator systems
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US3454114A
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Drilling machine
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US3490546A
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Drilling machine for use in small tunnels
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US3463247A
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Drill stem breakout apparatus
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US3339980A
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Centrally open cutterhead support for a boring machine
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US3301581A
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Drilling shafts
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US3410098A
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Tail section seals for shield tunneling machines
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US3232670A
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Tunnel-boring rotary head with adjustably mounted gauge cutters
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US3318099A
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Adjustable tunnel sets
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DE1283256B
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Device for moving the tubbings of a tunnel lining
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US3295892A
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Steerable tunnel-drilling machine
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DE1277293B
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Tunnel boring machine
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