Related to Custom operation

Salvage operation means any business, trade or industry engaged in whole or in part in salvaging or reclaiming any product or material, including but not limited to metals, chemicals, shipping containers or drums.
Farm operation means any activity conducted solely or primarily for the production of one or more agricultural products or commodities, including timber, for sale or home use, and customarily producing such products or commodities in sufficient quantity to be capable of contributing materially to the operator's support.
Gross Operating Profit For any Fiscal Year, the excess of Gross Revenues for such Fiscal Year over Gross Operating Expenses for such Fiscal Year.
Animal feeding operation (“AFO”) means a lot or facility (other than an aquatic animal production facility) where animals have been, are, or will be stabled or confined and fed or maintained for a total of 45 days or more in any 12-month period, and crops, vegetation, forage growth, or post-harvest residues are not sustained in the normal growing season over any portion of the lot or facility [40 CFR § 122.23(b)(1)].
In operation means engaged in activity related to the primary design function of the source.

Custom operation definition