Topographical Dictionary of Ancient Rome
Long the standard scholarly reference work on its subject. This is the orientation page to an (almost complete) transcription of it on this site.
http://penelope.uchicago.edu/Thayer/E/Gazetteer/Places/Europe/Italy/Lazio/Roma/Rome/.Texts/PLATOP*/home*.html

Constellation Technology Corporation
analytical instruments, instruments, scientific instruments, nuclear instruments, radiation detection, multichannel analyzer, spectrometers,
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BioComp Instruments
Manufactures and sells density gradient forming and fractionating instruments and blotting instruments and bottles.
http://www.biocompinstruments.com

Axon Instruments
Laboratory instruments and software for the neurosciences and genomics, and clinical monitoring instruments for neurosurgery and neurology.
http://www.axon.com/

Medworks Instruments
discounts on professional quality medical instruments and electronic components
http://www.medexamtools.com/

Team Tech Instruments Pte Ltd,
Supplier of electronic test and scientific measuring instruments, data recorders, and digital instruments. Singapore.
http://www.teamtech.com.sg

Axon Instruments, Inc.
Designs and manufactures quality laboratory instruments and software for the neurosciences, and clinical monitoring instruments for neurosurgery and neurology.
http://www.axon.com/

A.C. Tek Instruments
A.C. Tek Instruments - A.C. Tek offers top quality optical and surveying instruments and accessories. A.C. Tek technicians have over 30 years of experience in the instrument service industry; we are qualified for service on all Kern surveying instruments, as well as Wild, Leica, and other models.
http://www.actekinstruments.com/

Precision Measurements, Inc.
Full-service calibration laboratory provides NIST-traceable calibrations of metrology instruments, field test instruments, mechanical instruments, and process controls.
http://www.calservice.net/

Dresser Instruments
Manufactures pressure gauges and temperature measuring instruments; transducers and transmitters; control instruments; bimetal thermometers; test equipment; calibrators and instrument isolators.
http://www.dresserinstruments.com/