pony set

pony set

[′pō·nē ‚set]
(mining engineering)
A small timber set or frame incorporated in the main sets of a haulage level to accommodate an ore chute or other equipment from above or below.
References in periodicals archive ?
The decaled three-piece My Little Pony set is part of a new Hasbro license.
Aerospace worker Mike Burrowes, 41 and from Solihull, is behind another stunning entry - a pony set on a background canvas of a beautiful Shropshire sunset.