Adam Hilger, ltd
Analog - Instrumentos Analógicos Digitais Ltda
Askania-Werke A.G.
C.Baker
Carl Zeiss
Ealing
Ernest Leitz Wetzlar
F. Sartorius
Fennel Kassel
Gebr Wichmann
General Radio Company
Gustav Heyde
H.W. Egli S. A.
Heath Company
Hewlett-Packard Company
Institut G. Coradi
Instrumentos Elétricos Engro S.A.
J. W. Fecker, Inc
J.J. Shaw
James Jaquet A.-G. - Basel
Jarrel-Ash Company
John A. Brashear Company, Ltd
M. Thomas (De Colmar)
Maison A. Jobin
Max Kohl
Micronal S.A - Aparelhos de Precisăo
Mount Sopris Instrument Company
Ortec Incorporated an EG&G Company
Pacific Photometric Instruments
Ph & F. Pellin
Philipp Schenk
PHILIPS
Rádio Cinephon Brasileira S. A.
RELUMI - Material Elétrico Ltda
Richard Müller-Uri
Sensonics Ltd.
Sociedade Wild - Suisso-Brasileira de Engenharia Limitada
Société Genevoise D´Instruments de Physique
SPEX - Industries, Inc
Spindler & Hoyer - Göttingen
Tektronix, Inc e/ou Tektronix International A.G.
The Cambridge Scientific Instrument Company, Ltd
The Gaertner Scientific Corporation
The Superior Electric Company
Union Carbide Corporation
Varian Aerograph
Wild Heerbrugg Ltda