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单词 prop-crib timbering
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prop-crib timbering
prop-crib timbering n. Mining Obsolete a type of timbering used in mineshafts, in which frames (cribs) are separated and supported by props.
ΚΠ
1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 165 Prop-crib timbering, shaft timbering with cribs kept at the proper distance apart by means of props.
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