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GB785234A
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Improvements in pit props
|
|
GB788551A
|
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Yieldable mining gallery support structure of ring-shaped or arcuate form
|
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US2884272A
|
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Roof support structure for mine workings
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GB776194A
|
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Roof support structure for mine workings using props and pivotable girders
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GB777349A
|
|
Improvements in yielding mine gallery roof supports
|
|
GB759557A
|
|
Improvements in or relating to roof supporting structures and particularly mine roof supports such as pit props and arches
|
|
GB777568A
|
|
Telescopic steel pit prop
|
|
GB757595A
|
|
Mine roof supporting structure comprising props and girders
|
|
GB731217A
|
|
Improvements relating to pit props
|
|
GB767179A
|
|
Telescopic pit prop
|
|
GB767178A
|
|
Telescopic pit prop
|
|
GB722720A
|
|
Improvements in pit props
|
|
GB748013A
|
|
Improvements in and relating to pit props
|
|
GB699913A
|
|
Improvements in or relating to pit props
|
|
GB719215A
|
|
Support for mine workings
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GB684284A
|
|
Improvements in metallic pit props
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GB699344A
|
|
Improvements in or relating to dental root pin sets
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GB683142A
|
|
Improvements in or relating to pit roof supporting girders
|
|
GB660738A
|
|
Improvements in or relating to pit supports
|
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GB488363A
|
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An improved method for moulding jaw parts and mouth parts for the purpose of lining and correcting the same
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