| Business | Phone |
| Millennium Engineering & Sales 8780 Big Bend Blvd, Webster Groves 63119 | (314) 962-2832 |
| Livinston Consulting 729 Lilac Ave, Webster Groves 63119 | (314) 918-7276 |
| Kemco Engineering 541 Hollywood Pl, Webster Groves 63119 | (314) 962-7343 |
| Brucker Engineering 7547 Ravensridge Rd, Webster Groves 63119 | (314) 961-4495 |