Establishments primarily engaged in heat treating of metal for the trade.
- Annealing of metal for the trade
- Brazing (hardening) metal for the trade
- Burning metal for the trade
- Hardening of metal for the trade
- Heat treating of metal for the trade
- Shot peening-treating steel to reduce fatigue
- Stainless steel, brazing (hardening) for the trade
- Tempering of metal for the trade