prop-free

prop-free

[′präp ‚frē]
(mining engineering)
A face with no posts between the coal and the conveyor used to remove it in longwall mining of a coal seam.
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References in periodicals archive ?
Cornely's set is fairly prop-free, except for an elegant, late-appearing bedchamber.
As he addressed about 1,000 of the 10,000 refugees remaining in the tent community, he stood alone and prop-free.