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  Murata Electronics North America http://www.murata.com/
Produces a.o. feedthrough and SAW filters.
  Pole Zero Corporation http://www.polezero.com
Manufactures digitally tuned RF filters, notch filters, preselectors and low noise amplifiers.
  LCR Electronics, Inc. http://www.lcr-inc.com/
Design, development and manufacturing of custom and standard EMI filters.
  Spectrum Control Inc. http://www.spectrumcontrol.com
Manufactures aline of EMI/RFI filters, power products and EMC testing services including capacitors, discrete filters, filtered arrays, ferrite inductors, patch antenna elements and gaskets and shielding.
  Piezo Technology, Inc. http://www.piezotech.com
A manufacturer of frequency control products such as crystal oscillators, crystal filters, lc filters, and crystal resonators.
  KR Electronics http://www.krfilters.com
Designs and manufactures precision filters from dc to 3 GHz.
  Curtis Industries http://curtisind.com
Full line manufacturer of RFI filters - general purpose, high performance switching power supply, medical UL2601, 3 phase, power entry modules.
  Colby Instruments, Inc. http://www.colby-inc.com/
Manufacturer of precision programmable delay lines and phase shifters. Both mechanical and electronic solutions are offered with resolutions down to 0.25 ps, and bandwidth from dc to 18 ghz (dc to 40 gb/s nrz).
  Accute Micro Electronics Co. Ltd. http://www.accutemicro.com/
Manufacturer of dielectric ceramic filters for the communications industry. Includes product specifications, online catalogue (PDF), and photographs of their facility.
  Communications & Energy Corporation http://www.cefilter.com/
Manufactures and sells microwave filters for wireless television, cable television, low-power television, and personal communications service.
  ITF Co.,Ltd. http://www.itf.co.kr
Manufacturer of high-performance surface acoustic wave (SAW)components. Application areas include base stations, repeaters, terminals, HDTV and SAW resonators.
  http://www.tte.com http://www.tte.com
Produces bandpass filter, rf filter, and high pass filters.
  Netcom Inc. http://www.netcominc.com
Manufactures custom lc filters, oscillators, phase locked loops, crystal filters, and power supplies.
  Genisco Filter Corp. http://www.genisco.com
A custom solutions manufacturer for a variety of electromagnetic and radiofrequency interference problems.
  AEF Solutions http://www.aefsolutions.com/
Filtered connector solutions for electro magnetic interference including lightning and transient suppression.
  Vortex Technologies, Inc. http://www.vortextek.com/
Supplier of isolators, control surge protectors, and EMI\RFI filters.
  Custom Suppression, Inc. http://www.customsuppression.com
Custom manufacturer of miniature RFI filters and filtered connectors with suppression and transient devices.
  Jiaxing Acoustic Electric Industrial Company http://www.sawseek.com/
Manufacturer of saw devices, including SAW filters, resonators and duplexers.
  Oceangrove Developments Limited http://www.oceangrovedev.net
Produce RFI suppression capacitors, chokes and filter systems.
  OKY R&D Co., Ltd. http://www.oky.co.kr/
Manufacturer of EMI/EMC filters, choke coil and inverter surge filters.

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