prop-free front

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prop-free front [′präp ‚frē ‚frənt]

(mining engineering)

In coal mining, longwall working in which support to the roof is given by roof beams cantilevered from behind the working face.

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No references found			Pronucleus Pronunciamento pronunciation prony brake Proof proof by contradiction proof by descent proof firing proof load proof mark proof of concept proof plane Proof Press proof resilience proof spirit proof stress proof theory proof total PROOF/L proofread Proofreading Prop prop root prop-crib timbering prop-free prop-free front propadiene propaedeutic stratigraphy Propaganda Propaganda Film Propaganda Theater Propaganda, Monument Propagandist propagated blast propagated error propagation propagation anomaly Propagation By Cuttings propagation constant propagation delay propagation forecasting propagation loss propagation mode propagation notice propagation of plants propagation path propagation rate propagation step propagation time delay propagation velocity propagator			prop prop prop Prop (disambiguation) Prop (disambiguation) Prop (disambiguation) Prop (disambiguation) Prop forward Prop forward Prop forward Prop forward prop forwards prop forwards prop forwards prop forwards Prop jet Prop jet PROP REG prop root prop root Prop Rotor Gear Box Prop Speed Reduction Unit prop up prop up prop up prop up prop up prop- prop-crib timbering prop-free prop-free front Prop-shaft Prop-shaft prop. PROP1 PROPA PROPAC propadiene propaedeutic propaedeutic propaedeutic propaedeutic stratigraphy propaedeutical propaedeutical propaedeutical propaedeutics propaedeutics propaedeutics Propafenone Propafenone Atrial Fibrillation Trial Propafenone hydrochloride propagable propagable propagable propaganda propaganda propaganda Propaganda cult Propaganda Due Propaganda film Propaganda in Soviet Union

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