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Box culvert traveler for use with concrete forming systems

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Cut and cover
Patent

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Construction of underground galleries

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Cut and cover
Patent

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Method and structural elements for construction underground gara

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Cut and cover
Patent

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Method for underground excavation

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Cut and cover
Patent

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Semi-buried structure formed on a mountainside

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Cut and cover
Patent

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Telescopic tunnel form

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Cut and cover
Reexamination Certificate

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Tunnel construction apparatus and method

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Cut and cover
Patent

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Underground structural work including prefabricated elements...

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Cut and cover
Reexamination Certificate

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Underground tubular structural system and process for producing

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Cut and cover
Patent

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Underground tubular structural system and process for producing

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Cut and cover
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