C.S.STERN. Uma unidade portuguesa ao serviço da Industria portuguesa
Proposta da Azevedo & Pessi, Ldª de relés temporizadas datada de 26/07/1971 para CEAL / Azevedo & Pessi, Ldª
Ernest Tesch. Timing equipment (electrically-operated)
AEG. Measurements section - Portable indicating instruments / Allgemeine Elextricitäts Gesellschaft
ESIMAC. Aparelhos de medição eléctricos
Everett Edcgumbe. Peak voltmeter
Everett Edcgumbe. Electrostatic voltmeters
Volts & Amps, A.C Watts, ( Single or three phase). Ohms, & Megohms at 500 volts- test kit / Everett Edcgumbe
English Electric. Portable instruments - Model 285 : Ammeters & Voltmeters: D.C Moving Coil
English Electric. Portable instruments - Model 185 : A.C Ammeters & Voltmeters: Moving Iron
English Electric. Indicating instruments for use with motor control equipment
English Electric. Painel instruments types R25 and R35 moving coil round flush pattern