| Business | Phone |
| Argosy Industries Inc 600 S Andreasen Dr # D, Escondido 92029 | (760) 727-7006 |
| Ceramag Corp 926 S Andreasen Dr # 103, Escondido 92029 | (760) 746-5970 |
| Mesa Power Systems 2250 Micro Pl, Escondido 92029 | (760) 489-8162 |
| Palomar Engineers 2742 Bernardo Ave, Escondido 92029 | (760) 747-3343 |
| Nec Toppan Circuit Solutions 365 W 2nd Ave # 209, Escondido 92025 | (760) 735-6800 |