Sterling Transit Co Inc
Montebello, CA
MC-097382 DoT 58976
Ceased operations 1989
Profiled in Mike Terebecki's The Trucking Pioneers Book VI (click image to see Book index)
Patches of it that are in my project - Facebook Trucking Industry Insignia Patches
Other known patches
If you want your own trucking company memoribilia:
Items available on eBay
Note that patches sold by "freedomfifty2k" and "bob82ndabn325inf"are likely promo/replica patches, not patches actually used by the company represented.