| Year | 1924 |
| Date | 03-Apr |
| Volume | 50 |
| Issue | 1,197 |
| Page | 372 |
| Category | Electrical |
| Part | 1 |
| Title | The "C.-H." Electrical Locks |
| Author | B.Clements-Henry |
| Notes | Some of their Advantages and How to Make Them. Electro-magnetic control unit for enclosure within lock casing, staple-lock for door-lintel, elements of control action, plain lever-lock with "C.H." control No. 1 |