| Business | Phone |
| Bruml Design Engineering 1768 Middlehurst Rd, Cleveland 44118 | (216) 932-9155 |
| Control Engineering Cleveland 44103 | (216) 416-4660 |
| Dynamic Telcom Engineering 3401 Enterprise Pkwy, Cleveland 44122 | (216) 766-5781 |
| Gregory A Farone Engnring Inc 12118 Tucson Dr, Cleveland 44130 | (216) 433-9042 |
| Linea Engineering 23200 Chagrin Blvd, Cleveland 44122 | (216) 292-8159 |
| Naples Engineering 4510 E 71st St, Cleveland 44105 | (216) 641-6350 |