Meinberg
Time Server, DCF77 radio clocks, GPS Satellite Receiver, NTP time server, PCI Slot Cards and Accessories developed and manufactured by MEINBERG
http://www.meinberg.de/english/

Frequency Selection Database
Resource for USA frequency coordination and spectrum research.
http://www.spectrumwatch.com

Advanced Crystal Technology
A supplier of frequency control products offering standard and custom quartz crystals, crystal filters, oscillators and ceramic resonators.
http://www.advancedcrystaltechnology.com/index.html

Luff Research Inc.
Manufacture high performance RF frequency synthesizers and phase-locked frequency sources.
http://www.luffresearch.com/

ZZAP Elektronik d.o.o.
frequency converter, power supply, radio frequency reader, frekvencijski pretvaraci, izvori za napajanje, ups, radio frekvencijski citac, web design, web dizajn, electronic components, elektronicke komponente, konzalting, consulting, internet
http://www.zzap-elektronik.com

Fiab AB
Sweden. Design and manufacture of custom and standard model high-frequency welding machines for textiles, plastics, wood and teflon applications. Technical information on PDF files. Calendar of events.
http://www.fiabhf.se/

The 3nd Electronics Factory of Shijie Dongguan
Manufacturer of Power Factor Correction (PFC), standard power, audio frequency, and switching power transformers.
http://www.jd-elec.com/company.htm

Liteline Electronics
Lightline Electronics, products for the motion picture industry. Maker of the CineSpeedMeter2 and other precision frequency measurement products.
http://www.lightlineelectronics.com

Liteline Electronics
Lightline Electronics, products for the motion picture industry. Maker of the CineSpeedMeter2 and other precision frequency measurement products.
http://www.lightlineelectronics.com

Elmika Microwave Technologies
Sweep oscilators, scalar and vector analizers, frequency converters, attenuators, frequency meters and waveguide components.
http://www.elmika.com/