37.		The art of protective relaying / General Electric
38.		Type TF frequency-type telemetering equipment / General Electric
39.		Electrical developments of 1938 / General Electric
40.		Electrical developments of 1945 / General Electric
41.		Electrical developments of 1946 / General Electric
42.		Everything electrical / General Electric
43.		Electrical installation material / General Electric
44.		Equipment for industry / General Electric
45.		At the turn of the century / General Electric
46.		Journey round the world / General Electric
47.		Lâmpadas eléctricas / General Electric
48.		Iluminação Pública / General Electric