North Carolina Administrative Code Title 17 — Revenue
17 NCAC 07B .4514 — Cleaning Machinery Repairs
Sales of welding rods to commercial laundries and dry cleaning operators for use in repairing machinery used directly in the laundering or dry cleaning service are exempt from sales and use tax. Sales of oxygen and acetylene to such operators for use in repairing machinery are subject to the applicable statutory state and local sales or use tax.
Source: official text