AA
Acu-Math
Acu-Rule
Addiators
Advergi
Aeronav Inst.
Ahrend
Alba
Alco
ALKU
ALRO
Altma
Alvin
American Spring of Holly
Antica Fabbrica
Archimedes
ARCUS
Aristo
Arlton Workshop
Arnault & Paineau
Associated Spring
Aston&Mander
Atlas
Australian
Avergi(BRL)
Avol
Azzola
Ballardie
Batori Comp.
Beacon
Beta Enterprises
Billeter, Julius
Billeter, Ernst
Blundell(BRL)
Boucher, Albert
Bousfield
Boykin
Bristol Line
British
British SR Co
British Thornton
Browne, Arthur, & Bros
Browne, C.O.
Bruning
Bushell
Buss Maker
CAL
Calpini
Calculigraphe H.C.
J.B. Carroll Co.
Cellograf
CENCO - Central Sci.
Charpentier
Charvoz-Roos
Chinese
Classic
Clementson
Climatemaker
Concise
Compass
Connecticut Spring
Controller
C-Thru
Cox & Stevens
Cruver
CURTA
Daemon-Schmid
Damien, Maurice
Dargue Brothers.
Davis Instruments

Deeva
Dempster
Dennert & Pape
Denmark
Dietzgen
Digi-Craft
Disney
Diwa
Donkin
Dring & Fage
Dupa
Eagle
Ecobra
Educational Inst
Empire
Engineer's
Engineering Inst
Engineering Mfg Co.
English Electric Co.
ESCO Eng.Sales Co.
E.TATA.
Faber-Castell
FangYuan
Farmar, F.C.
Farmar, Theo.
Favor-Ruhl
Fearns
Fedra
Felsenthal
Festus
Filotecnica
Flying Fish
Foreign
Fowler
Foxboro
Frederick Post
Friedmann
Froude
Fuji
Fullerton
Gemini Eng
Gamma
Geotec
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General Lumin.
Gerber
Gibson Spring
Gilson
Gisholt
Globemaster
Gong Se He Ying
Graphic Calculator
Graphoplex
Gravet Lenoir
Griffin
Grizzle, B.F.
Guedon
Hai Ou
J. Halden
Hangzhou
Hannyngton
Heaven
Helix Regal
Hellerman
Hemmi
Henri Chatelain
Henschel
Henry Herbert
Hewig

HH Universum
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Hope
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Huet
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Human Factors
Indeco
Intra
IWA
Jakar
JAM Argentina
Jason
Jepesson
Jiang Shi
Jian She
Joint Rules
Jones Metabolism
Jordan, Ben
Joe Klawun
Kahl Scientific
Karl-Wess
Kel-Co
Keyline
Kent
Kern
Keuffel&Esser Std
Keuffel&Esser Spc
Klawun
Koch, Huxhold & Hanneman
Koh-I-Noor
Kudlaty, W.J.
Korean
Kolesch.Co.
Kutsuwa
Lakeside
Lawrence
Lafayette
Lietz
Loga
Logar
Logarecta
Logarex
Lord's
Lutz
Lutz Ferrando
Mander
Marc
Marcantoni
Master Electric
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Matthijssen
Maurice Damien
Mead
Meissner
Micador
Micronta
Molter
Muiderkring
National
Neolt-Bergamo
Neal Feay
Nestler
Nicholl, J.A.
Nobema
Norden
Norton & Gregory

D.Van Nostrand
Novotni
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ODELCO
Olson
Omega
Orions
Otis King
Paisley
Parisian Novelty
Pedigree
Perrygraf SR
PIC
Pickett
Pilot
Plastigraf
Plastograf
Plus & Minus
Post
Precision Scale Co
Prestige
Rabone
Radio Shack
Ramenskoye
Ransley, W.
Ratcliffe
Reiss
Relay
Renovation
Richardson
Ricoh
Rista
Roberts
Romanian
Roos
Routledge
Royal
Ruyi Si Da
Safetech.
Salmoiraghi
Sama & Etani
San-ai Keiki Co.
Sandia Corp.,
Sans & Streiffe
Santok
SCA
Schacht & Westerich
Sci.Inst.Co. SIC
Sci.SR Craft, Bejing
Seehase, Dr. Ing.
Service SR
Service Studios
Shanghai
Shanghai Ding Feng
Shanghai Si Da
Sheyang Dali Factory
Simplon
Short & Mason
Shure Bros.
Skala
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Squirrel
Small, Gilbert
Soviet-Factory#10
Soviet-KLPZ
Soviet-LFAI
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Soviet-SPZ

Soviet-STP VMP
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SR&SECO
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Standardgraph
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Stanley-Boucher
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Sweden
Swinston
T and T Electric
Taisho Kogyo
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Tianjin Squirrel
Thacher
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TOBE
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Toyo
Triso
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Uchida Yoko
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UNIS
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UTO
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VEB EAW
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Vittorio Martini
Wallace Barnes
Weber
Weems & Plath
Wenzhou
Weil, J.H.
White & Gillispie
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Wichmann
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Wiljon Technik-Art
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Yabsley, G.M.
Xuesh
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