À volta dos Volts (Editorial) / Hermínio Duarte Ramos
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
Electronic measuring and microwave instruments / Philips
Ernest Tesch. Timing equipment (electrically-operated)
AEG. Measurements section - Portable indicating instruments / Allgemeine Elextricitäts Gesellschaft
High voltage laboratory technique / J. D. Craggs, J. M. Meek
Questions and answers about capacitors : comments about fifty common questions asked by utilities about the selection and application of power capacitors / P. E. Hendrickson
Portable instruments / Roller-Smith
Electrical laboratory apparatus and educational service, for colleges and technical schools / General Electric