Swisstek Inc.
Kern, Zeiss, Wild and Leica: All E1/E2/DKM2-A & Eth2/Elta Theodolites Calibrated-Repaired-Serviced-Bought-Sold-Traded
http://swisstek.tripod.com/

Caddock Brothers Ltd
Caddbro is a family business supplying high quality specialist surveying equipment to builders, construction companies, civil engineers, surveyors, utility companies, and for private use.
http://www.caddbro.co.uk/

Tianjin Wangding Optical Instruments, Ltd
Surveying instruments and attachments including automatic levels, electronic theodolites, optical theodolite, tripods and tower rulers.
http://www.twopsurvey.com/

Tianjin Wangding Optical Instruments
Specializes in surveying instruments and their attachments. Products offered include automatic levels, electronic theodolites, optical theodolite, tripods and tower rulers.
http://www.twopsurvey.com/default.htm

Spectra Integrated Systems Inc.
Provides the products, services, and support you need to successfully automate your construction processes. Finish faster with lower costs and greater accuracy.
http://www.spectra-is.com/

Coordinate Measurement Systems Committee
Coordinate Metrology Systems Conference
http://www.cmsc.org/