Polyphase switchboard watthour meters : types DS-19, DSW-19, DSM-19, DS-20, DSW-20, DSM-20, DS-34, DSW-34, DSM-34, DS-35, DSW-35, DSM-35, DS-43, DSW-43, DSM-43, DS-44, DSW-44, DSM-44

General Electric

16 p. ; 30 cm

EDP Mobiliária - Central do Freixo

Electricidade; Aparelhagem eléctrica; Aparelho de medida; Wattímetro

1959