Kumkang Quartz Co., Ltd
Manufacturer of quartz ware - tubes, boats and other quartz wares for semiconductor processing.
http://www.kkquartz.co.kr/

Norell Inc.
Norell Inc. - Leading Manufacturer of Precision NMR Sample Tubes, Economy NMR Tubes, Ultra Precision I.D. and O.D. Tubing, Pyrex and Quartz Sample Tubes, and NMR Accessories. Your Choice For NMR Tubes and Accessories.
http://nmrtubes.com

How Crystal Watch Works
Quartz watches actually use quartz crystals to keep time. How can they be so accurate? Find out why quartz makes such a great time keeper.
http://www.howstuffworks.com/quartz-watch.htm

GianTek Quartz Material (Shanghai) Co.
Chinese manufacturer of quartz tube, rod, plates/discs and other custom fused quartz products for a wide range of industrial and laboratory applications.
http://www.gian-tek.com/

TubeTronic
tubetronic.com
http://www.tubetronic.com/

Chintele Quartz Technology Co Ltd
A Chinese manufacturer of piezoelectric quartz, quartz products and single crystal optical products for use in the telecommunications and general time and frequency industries.
http://www.chintele.com

United Silica Inc
USP has offered quartzware and quartz fabrication for all types of quartz tubes and carriers for over 15 years. Other products include but are not limited to: wafers, discs, and liners
http://www.unitedsilica.com/

OMIG S.A.
Manufacturer of quartz filters and quartz crystals for TCXOs, VCXOs, and OCXOs, and vacuum depositing process control quartz crystals. Site in English and Polish, and include product specification ranges and PDF part catalogs.
http://www.omig.com.pl/

Phamitech International Company Ltd
Exporter of electron tubes, TWT, valves, thyratrons, magnetrons, klystrons, transmitting tubes, heating tubes, vacuum interrupters and X-ray tubes made in China
http://www.phamitech.com

H. Baumbach and Co. Ltd
Manufacturers of quartz and borosilicate glassware, optical components, cells, polished discs, pyrolysis tubes for laboratory uses. Custom rand prototype design and work.
http://www.h-baumbach.co.uk