Hollerith Operations
Joan Allen - Hollerith operator and team leader, Bletchley Park and Drayton Parslow E J Bandy - Hollerith operator, Bletchley Park Sybil Cannon - Hollerith operator, Bletchley Park Catherine Claydon - Bombe operator, Eastcote and Hollerith operator, Drayton Parslow
Iris King - Hollerith operator, Bletchley Park Joan Joslin - Hollerith operator, Bletchley Park
| 
