Stock-in-trade

The stock-in-trade of this old gentleman comprised chronometers, barometers, telescopes, compasses, charts, maps, sextants, quadrants, and specimens of every kind of instrument used in the working of a ship's course, or the keeping of a ship's reckoning, or the prosecuting of a ship's discoveries.

[…] Oscar was in the midst of drafting an account of Red Ochre's stock-in-trade for presenting to a man named Burywell who was contemplating taking on the lease […]

Devons Road has had its teething troubles as a dieselised depot, just as have the diesel locomotives which are its stock-in-trade.

Ideas are the chief stock-in-trade of newspaper writers and generally they are the scarcest stock in market, but they do come occasionally