11.		English Electric. Instantaneous voltage, Overcurrent and Earth fault Relays - Types CAG and VAG Data: [s.d.]
12.		English Electric. High stability circulanting current relay - Type CAG 14 Data: [s.d.]
13.		English Electric. Relay Tools Data: [s.d.]
14.		English Electric. New from the meter, relay and instrument division Data: [s.d.]
15.		English Electric. Motor protection relay Data: [s.d.]
16.		English Electric. Transformer percentage differential relay Type DDT 50 and 60 C. P.S Data: [s.d.]
17.		English Electric. Auxiliary and indicator relays types: CAA, VAA,CAF, and VAF Data: [s.d.]
18.		English Electric. High speed biased differential realy Data: [s.d.]
19.		English Electric. Check Alarm relay - type VAK 12 Data: [s.d.]
20.		English Electric. Trip circuit supervision relay type Vax Data: [s.d.]