Poisson-Poisson distribution Poisson-Binomial distribution Compound distribution

Rosin-Rammler distribution and amendatory Gauss distribution

space distribution -regularities of distribution

adjustable prop

Anchor Prop

battered prop

collapsible prop

compressible prop

Dobson prop

Double-telescopic Prop

Dowty prop

enhanced prop treatment

expanding prop

extensible prop

ferroconcrete prop

friction yielding prop

frictional metal prop

frictional prop

green prop