Lefty's
Manufacturer of dual throttle control kits and accessories. USA.
http://leftysasap.com

Williams Controls, Inc.
Throttle Controls, Electronic throttle controls, Hydraulic controls, Hydraulic throttle controls, Pneumatic Throttle Controls, Air controls, PTO controls, Pedals, Floor Pedals, custom throttle design, Adjustable pedal systems, General Purpose Pneumatic Products, Regulating Control Valves, Directional Control Valves, Relay Valves, Electronic Foot Pedal Assembly, Electronic Suspended Pedal Assembly
http://www.wmco.com/

Throttle Werks
Harley-Davidson Customization
http://s91960742.onlinehome.us/temphold/throttle/index.php

Beechhurst Industries,Inc.
Manufacturer of mechanical control systems,quadrants,landing gear selector switches,push-pull controls,cable assemblies and speciality automotive electronics.
http://www.beechhurst.com/

Viat Instruments Pvt.Lld.
Manufacture pressure relief devices, throttle valves and dehydrating silicagel breathers for power transformers.
http://www.viatin.com

VMAC
VMAC is an industry leader in the development of powerful and compact truck mounted air compressor systems: UNDERHOOD Belt-driven Air Compressors up to 150 cfm and PREDATAIR Hydraulic Air Compressors up to 60 cfm. VMAC also designs throttle controls to idle up truck engines to power auxiliary truck equipment.
http://www.vmac.ca

Dye Precision, Inc.
Complete source for technical information on all Dye and Proto paintball markers.
http://dyematrix.com/

DyneSystems, Inc.
Integrated dynamometer systems for testing engines, electric motors, transmissions and other rotating equipment. Digital dynamometer and throttle controls, Midwest and Dynamatic Eddy Current and AC & DC dynamometers, test automation software and data acquisition systems.
http://www.dynesystems.com/

Throttle Design Studios, Ltd.
Studio specializing in identity, digital, and print design. Portfolio. Columbus, Ohio.
http://www.throttlestudios.com/

Jinggong Instrument
Manufacture of orifice plates, nozzles, venturi tubes and other standard or non-standard throttle devices. From China.
http://sc-china.com/