PL264877A2 - Apparatus for protecting the sulfur winning bore-hole mining head against consequences of blockage in telescoped joints of boring tower rigging
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Apparatus for protecting the sulfur winning bore-hole mining head against consequences of blockage in telescoped joints of boring tower rigging
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PL26487787A1987-03-271987-03-27Apparatus for protecting the sulfur winning bore-hole mining head against consequences of blockage in telescoped joints of boring tower rigging
PL147102B2
(en)