Piezo Technology, Inc.
A manufacturer of frequency control products such as crystal oscillators, crystal filters, lc filters, and crystal resonators.
http://www.piezotech.com

Precision Devices, Inc.
Manufactures crystal products in custom and SMD packages including quartz crystals, crystal filters and crystal oscillators. Online line card, specifications and PDF catalogue and data sheets available for download.
http://www.pdixtal.com/

CT Industries
Manufacturer of crystal resonators, tuning fork, oscillators, crystal filters, SAW devices, ceramic resonators, ceramic filters, flexible flat cable.
http://www.ct-intl.com.hk/

OPT Hellas Custom Frequency Control Components
Manufacturers crystals, crystal filters, lc filters rf and microwave filters. Descriptions and catalogs and international sales network.
http://www.opthellas.com

Nihon Dempa Kogyo Co., Ltd.
Manufacturer of quartz crystal products, crystal units, VCXO, TCXO, TC-VCXO, SAW devices, crystal filters, optical components and ultrasonic transducer.
http://www.ndk.com/

AXTAL
Manufacture of crystal oscillators PXO, VCXO, TCXO, OCXO, DOCXO, crystal resonators (quartz, langasite lgs, galliumphosphate gapo4), crystal filters, gps-ocxo, clock recovery modules cdr.
http://www.axtal.com

MtronPTI
MtronPTI - Manufacturer of crystal oscillators, TCXOs, VCXOs, Crystal Filters, LC Filters, and Frequency Control Products.
http://www.mtronpti.com/

Hy-Q International (Australia) Pty. Ltd.
Hy-Q International is a 100% Australian owned company dedicated to the supply of frequency control products to the highest international standards. Our product range includes quartz crystal units, filters, DIL's, voltage controlled, temperature compensated and oven controlled oscillators, monolithic and discrete filters as well as ceramic filters and resonators. Micro audio devices including micro speakers, condenser microphones, electromagnetic buzzers and sirens.
http://www.hy-q.com.au

Netcom Inc.
Manufactures custom lc filters, oscillators, phase locked loops, crystal filters, and power supplies.
http://www.netcominc.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