English Electric Company negatives

The drawer contains c 100 large film negatives in envelopes of drawings. Drawing number range P2220 - P2228. Samples are below:

P2220Z001 A - Traction Line Breaker Clamp

P2204/001 A - Traction Control Gear: Magnet Yoke (Line Breaker)

P2209Z001 A - Traction Line Breaker, Soapstone blank

P2222M001 B - Traction Control Gear, General Assembly of No 2 Form A Control and Setting Switch