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E - Fixed Constructions – 21 – D
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High-load underground dam

E - Fixed Constructions – 21 – D
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High-strength anchor system, safe room bulkhead, and method...

E - Fixed Constructions – 21 – D
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Hinged base for shoring strut for use in construction and...

E - Fixed Constructions – 21 – D
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Hollow bars and method of manufacture

E - Fixed Constructions – 21 – D
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Hollow fiber glass roof bolt

E - Fixed Constructions – 21 – D
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Hollow rock bolt, self -drilling rock bolt and method of...

E - Fixed Constructions – 21 – D
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Hook plow apparatus for longwall mining

E - Fixed Constructions – 21 – D
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Horizontal earth boring machine

E - Fixed Constructions – 21 – D
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Hydraulic excavator driven by more than one type of energy

E - Fixed Constructions – 21 – D
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Hydraulic prop having a filling valve and a clearing valve...

E - Fixed Constructions – 21 – D
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