Adress Translation Cache 
Adress Translation Controller 
Aerial Tuning Capacitor 
Air Transport Committee 
Aircraft Technical Committee 
Airman, Third Class 
Alcoa Technology Center 
Alloy-Tin Couple 
American Technical Ceramics 
Antenna Tuning Capacitor 
Applied Technology Center 
Arbitration Timing Control 
Armament Training Center 
Army Topographic Command 
Ashton-Tate Corporation 
Association of Translation Companies 
Atlanta Crackers 
Atom Count 
Australian Telecommunications Commissi… 
Australian Trade Commission 
Authorization to Copy 
Automatic Through Center 
Automatic Toggle Clamp 
Automatic Tool Change 
Automation Training Center 
Administrator Training Center 
Advanced Training Centre 
Airport Traffic Control 
Assistant Test Conductor