- American Engine Installation
- American Engine Installation
- Arthur Motor Co
- Automotive Control Engineering
- Bard Engineering
- Baytech Corp
- Biodymanics Engineering
- Biodymanics Engineering
- Bishop-Buehl Engineering
- Bishop-Buehl Engineering
- Carobu Engineering LLC
- Dailey Engineering
- Dawgpound Automotive
- E J Armor
- Ecologic Engine Testing
- Ecologic Engine Testing
- Envera
- Evoluzione Net Inc
- Global Vehicle Svc
- Global Vehicle Svc
- Grams Engineering
- Grams Engineering
- Harold Daigh Engineering
- Howell Engineering Co
- JAM Engineering Corp
- KEVA Engineering
- L B J's Automotive
- Magna-Guard Inc
- Massy Engineering
- Mc Kibben Engineering Corp
- Mc Kibben Engineering Corp
- Modern Engine Inc
- Peter Thom & Assoc Inc
- R & D Factory
- Richard C Hodson
- Salinas Automotive
- Stasis Engineering
- Syson-Hille & Assoc
- Victor Armbrust
