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US3250078A
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Apparatus for driving tunnels
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Apparatus for lining tunnels with concrete
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Apparatus for driving tunnels
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Vehicle for transporting concrete
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Vehicle for transporting concrete
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Apparatus for controlling the application of concrete in the lining of tunnels
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Method of and apparatus for lining tunnels with concrete
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Method of and apparatus for mixing concrete
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Method and apparatus for placing fluent material
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Apparatus for transporting materials
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Closure mechanism
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Apparatus for handling materials
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Tunnel cementing apparatus
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Gate closure
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CA418811A
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Pneumatic conveying apparatus
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CA648173A
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Method of and apparatus for lining tunnels with concrete
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CA550179A
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Method of and apparatus for controlling the application of concrete in the lining of tunnels
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CA637068A
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Method and apparatus for placing fluent material
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CA663743A
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Apparatus for driving tunnels
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CA592505A
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Vehicle for transporting concrete
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