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- A. Lietz
- Ahrend / Ahrin
- Air instruments Inc
- Ajax Engineering Co.
- American Paulin
- Apelco
- Astromedia Verlag
- Black + Decker
- Bosun
- Brand Fréres
- Butenschon
- C. Lewert
- C. Plath
- Carac
- Cary
- Central Scientific Company
- Charvoz
- Chesterman &Co
- Consolidated Instrument corp
- Cooke Hull
- Cooke Troughton Simms
- Cruver Mfg Co
- David White Co
- Davis Instruments
- de Koningh
- Decca Navigator Co
- Dillon Beck Mfg Co
- E.R. Watts and Son
- Ebbco
- Ed Sprenger
- Einson Freeman Co
- Electronic Laboratories
- Elliot Brothers
- Ertel & Sohn
- ESP Ltd.
- F. Barker and Son
- Faber Castell
- Fairchild Aviation
- G Mattheys
- G. Coradi
- Garmin
- H. Haecke
- Haff
- Heath & Wing
- Heath and Co
- Hemisferium
- Henry Browne and Son
- Henry Hughes and Son
- Hewlett Packard
- Hilger and Watts
- Hopkins Manufacturing
- Ilon Industries
- Irion & Vosseler
- J. Coombes
- JH Steward
- John Bruce and Sons
- Kelvin Hughes
- Kent
- Keuffel and Esser
- Kollsman Insrument
- KVH
- Lafayette Instruments
- Laserline Mfg
- Lefevbre Poulin
- Linex
- Link Aviation Devices
- Lomvum
- Lufkin
- Mechanism Ltd
- Mercer
- Mergenthaler Linotype
- Nooitgedagt
- Observator
- Optikotechna
- Ott
- Paul MacAlister
- R. Reiss
- Riefler
- Robert I Gordon
- Scansys
- Schick
- Sercel (Spectra Precision)
- Short & Mason
- Siemens Brothers and Co
- Silva
- Skandia
- Smiths Aircraft Instruments
- Stabila
- Stanley London
- Stanley Tools
- T. Cooke and sons
- Tamaya Technics
- Tavernier Gravet
- Technowa
- Things of Science
- Throughton & Simms
- TomTom
- Trimble
- US Naval Gun Factory
- van Essen
- VEB Freiberger
- Vyner
- W.Boosman
- W.L.Weissen
- Weems and Plath
- Welch Scientific Company
- Western Electric
- Wild Heerbrugg
- Wm. Ainsworth and Sons
- Books
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Sextant
The 'true' sextant measures an angle of 120 degrees. Sextants are invariable made of metal (or plastic) and can be of the 'drum' or 'vernier' type where it comes to the fine reading. The drum type uses a scale graduated in whole degrees and a wormgear to measure within the minute. The vernier type uses a scale along which a finely graduated scale slides. They are usually less accurate than the drum type.