- Edwards Heat Treating Svc
- Eklund Metal Treating Inc
- Electro Seal Corp
- Elmira Heat Treating Inc
- Engineered Heat Treat Inc
- Engineered Heat Treat Inc
- Erie Steel Treating Inc
- Euclid Heat Treating Co
- Even Temper Cryogenics
- Even Temper Cryogenics
- Ex Cel Heat Treating Inc
- Ex-Cel Heat Treating Inc
- Exotic Metal Treating
- Expedient Heat Treating Corp
- Expert Brazing & Heat Treating
- Fireball Heat Treating Co
- Flame Metallurgical Inc
- Flame Metallurgical Inc
- Flame Metals Processing Corp
- Flame Treating & Engineering
- Flame Treating Systems Inc
- Fox Valley Heat Treat
- FPM Heat Treating Inc
- FPM Heat Treating Inc
- FPM/Ispen Heat Treating
- FPM/Milwaukee
- Franklin Brazing & Metal Treat
- Fred Heinzelman & Sons
- Frey's Tasty Treat Inc
- Frontier Heat Treating
- Furnace Rebuilders Inc
- Furnace Source
- G M Enterprises
- Gainesville Machining Inc
- Galan Straightening
- Galion LLC
- General Heat Treating Co
- General Heat Treating Corp
- General Metal Heat Treating
- General Surface Hardening Inc
- General Surface Hardening Inc
- George H Porter Steel Treating
- Gibson Heat Treat Inc
- Gkn Aerospace Chem-Tronics Inc
- Great Lakes Metal Treating
- Great Plains Metallurgical Co
- H & H Commercial Heat Treating
- H & H Heat Treating
- H & H Heat Treating
- H & H Heat Treating Corp
- H & M Metal Processing Co
- H & M Metal Processing Co
- H J Heat-Treat Co
- H-A Industries Inc
- Hansen Balk Steel Treating
- Harbor Metal Treating Co
- Harbor Metal Treating Inc
- Harvard Metal Treating Inc
- Hayes Heat Treating
- Heat Management
- Heat Treat Inc
- HEAT Treat Inc
- Heat Treat Professionals Inc
- Heat Treaters Inc
- Heat Treating Engineers Inc
- Heat Treating Equipment Inc
- Heat Treating Equipment Inc
- Heat Treating Svc Corp
- Heat Treating Svc Corp
- Heat Treating Technologies Inc
- Heat-Treating Inc
- Heatbath Corp
- Heatbath Corp
- HEF USA
- HEF USA
- Hercules Heat Treating Corp
- Hercules Heat Treating Corp
- Hi Tech Heat Treating Inc
- Hi Tecmetal Group Inc
- Hi Tecmetal Group-Heating
- Hi-Tech Heat Treating
- Hi-Tech Steel Treating Inc
- Hi-Temp Inc
- High Performance Fasteners
- HMT Inc
- Honetreat Co
- Houston Flame Hardening Co
- Houston Flame Hardening Co
- HST Svc
- Hudapack Metal Treating
- Hudapack Metal Treating
- Hy-Temp Inc
- Hydro-Vac
- Illinois Flame Hardening Inc
- Imp Heat Treating LLC
- Imt Duncan LLC
- Imt York LLC
- Indiana Metal Treating Inc
- Indianpolis Thermal Procng Div
- Induction Engineering Inc
- Induction Heat Treating
- Induction Heat Treating Corp
- Induction Heat Treating Corp
- Induction Processing Inc
- Induction Services
- Induction Services Inc
- Industrial Cryogenics
- Industrial Heat Treat
- Industrial Heat Treating Inc
- Industrial Heat Treating Inc
- Industrial Metal Treating Corp
- Industrial Steel Treating Co
- Industrial Technologies
- Ingersoll CM Systems Inc
- Inland Northwest Metallurgical
- Innovative Tool Sales
- Instrulab Inc
- International Induction Inc
- International Industrial SVC
- International Industrial SVC
- Ironbound Heat Treating
- J F Heat Treating Inc
- J V Industrial
- J V Industrial Co
- J V Industrial Co
- Jasco Heat Treating Inc
- JMA Heat Treat Svc
- JMA Heat Treat Svc
- Jv Industrial Co
- K & D Heat Treat Inc
- K & D Heat Treat Inc
- K Kaponis Aluminum & Cleaning
- Kansas Heat
- Kauffman Products Inc
- Kee Services
- Kelson Inc
- Kelson Inc
- Kelson Industrial Svc
- Kelson Industrial Svc Inc
- Ken's Heat Treating Stress
- Ken's Heat Treating Stress
- Kenney Steel Treating Corp
- Kenney-Southland Heat Treating
- Kentucky Heat Treat Co
- Kodak Heat Treating
- Kodent Inc
- Kodent Inc
- Koral Labs Inc
- Kowalski Heat Treating Co
- Krohn Industries Inc
- LA Mirada Heat Treat LLC
- Lake City Heat Treating Inc
- Lark Heat Treating Inc
- Lark Heat Treating Inc
- Lawrence Industries Inc
- Learman Electronic Tool Inc
- Leed Thermal Processing Inc
- Lone Star Heat Treating Co LTD
- Lone Star Heat Treating Co LTD
- Lone Star Heat Treating Co LTD
- M T Heat Treating Inc
- Machine Tool & Gear Inc
- Magnum Induction
- Mangold Engineering
- Manning's USA
- Manning's/Superior Heat Trtng
- Mannings Thermal Specialists
- Mannings USA
- Mannings USA
- Mannings USA
- Mannings USA
- Mannings USA
- Mannings USA
- Mannings USA
- Mannings USA
- Mannings USA Inc
- Mannings USA Inc
- Mantis Co
- Manufactured Alloys Inc
- Martin Kurz & Co Inc
- Materials Development Corp
- Maximum Stress LTD
- Mc Englevan Heat Treating
- Med-Tek Inc
- MEG Systems Corp
- Met-Co Industries
- Met-Tek Inc
- Met-Tek Inc
- Metal Improvement Co
- Metal Improvement Co
- Metal Tek Inc
- Metal Treat Inc
- Metal Treaters Inc
- Metal Treating & Research Co
- Metallurgical Enterprises
- Metallurgical Processing
- Metallurgical Processing
- Metallurgical Solutions Inc
- Metals Engineering Inc
- Microwave Synergy
- Mid-America Heat Treat Inc
- Mid-East Flame Hardening Inc
- Mid-South Metallurgical Co
- Middle States Oil Co
- Middle States Oil Co
- Midessa Heat Treat Inc
- Midwest Thermal Vac Inc
- Mik-All Metal Treating
- Mil-Spec Heat Treating
- Mil-Spec Heat Treating
- Mirror Images
- Missouri Heat Treat Inc
- Modern Heat Treating
- Modern Heat Treating & Forging
- Modern Metal Processing
- Moore Mc Millen Industries Inc
- MPT America Corp
- MQS Inspection Inc
- MQS Inspection Inc
- MQS Inspection Inc
- MRP Design Group
- MSI Automation
- MVM Enterprises
- National Induction Heating
- National Induction Heating
- National Metal Processing
- Nelson Heat Treating Co
- Neptune Heat Treating Inc
- Nevada Heat Treating
- New Britain Heat Treating Corp
- Newton Heat Treating
- Nitrex Metal Technologies Inc
- Nitrex-West Coast Operation
- Nitro Steel
- Nitro-Vac Heat Treating Inc
- Nitron-Inc
- Nitrotech
- Non-Ferrous Heat Treating Inc
- Nor-Cote
- North American Cronite
- Northeast Metals Technologies
- Northern Comfort Heating
- Northland Heat Treating
- Nuvonyx Inc
- Ohio Flame Hardening Co
- Ohio Metallurgical Svc Inc
- Oil City Iron Works Inc
- Old Hickory Heat Treating Co
- Omega Metal Treating Inc
- Omley Industries Inc
- Orange Heat Treaters
- Orchid Mc Allen
- Orchid Mc Allen
- Oregon Induction Corp
- Owego Heat Treat Inc
- Pacific Heat Treating Co
- Packaging Service Corp
- Pala Heat Treating LLC
- Palemetto Heat Treating Inc
- Palmdale Heat Treating
- Paulo Products Co
- Paulo Products Co
- Paulo Products Co
- Performance Heat Treating Corp
- Permian Heat Treaters
- Peterson Heat Treating Svc
- Phoenix Heat Treating Inc
- Phoenix Metal Treating Inc
- Phoenix Services
- Piedmont Heat Treating
- Pillar Industries Inc
- Pillar Industries Inc
- Pinnacle Gas Treating
- Pinson Valley Heat Treating Co
- Pioneer Industrial
- Pioneer Metal Finishing Inc
- Polar Bear Cryogenics Co
- Polarteck
- PPC Inc
- Precision Flame Hardening
- Precision Heat Treating
- Precision Heat Treating
- Precision Heat Treating Corp
- Precision Heat Treating Corp
- Precision Heat Treating Corp
- Preheat Inc
- Pressure Technology Of Ohio
- Prince & Izant Co
- Process Techs
- Productive Technology
- Progressive Heat Treating Co
- Progressive Steel Treating Inc
- Prox Co Inc
- Pyro-Tech Tool Treating
- QMT Quality Metal Treating
- Qtech Heat Treat
- Quality Heat Treating
- Quality Steel Treating LLC
- Quanex Heat Treat
- R & H Mechanical