Tetra Technologies, Inc.
Manufactures chemicals for the oil, gas, process, technology, and specialty firms.
http://www.tetratec.com/

PDLT Ltd
PDLT.
http://www.pdlt.co.uk/

Aqua Tetra
NeoPets.Com - Virtual Pet Community! Join up for fun, games, shops, auctions, chat and more!
http://home.neopets.com/templates/homepage.phtml?pet_name=aqua_tetra

Tetra Werke, Melle
Tetra Germany
http://www.tetra.de/

Tetra Acoustics
Manufacturer of hand made loudspeakers for stereo and home theatre users. Australia.
http://users.bigpond.com/tetra-acoustics/

Topos Communications
Company active in Fleet Management Systems, GIS, GSM and TETRA applications, and smart cards.
http://www.n-topos.gr/

Tetra Mold and Tool, Inc.
Complete Engineering, Design and Build of Custom Automated Equipment, plastic and rubber molds and custom injection molding of all plastics and rubber.
http://www.tetramold.com/

Sepura
Sepura specialises in secure TETRA based digital private mobile radio voice and data communication systems for public safety users such as Police Forces, Fire Brigade and Ambulance Services
http://www.sepura.com/

Verifikation, Kalibrierung und Bewertung eines Ausbreitungsmodells für digitalen Bündelfunk (TETRA
Diplomarbeit von Sebastian Schirra an der Universität Duisburg.
http://e-schirra.de

Pt. Tesso Tetra Chemika
Manufacturer of drilling fluid additives and oilfield chemicals. Located in Indonesia. Includes a catalog of products.
http://www.tesso.com/