| Year | 1930 |
| Date | 22-May |
| Volume | 62 |
| Issue | 1,515 |
| Page | 489 |
| Category | Electrical |
| Part | |
| Title | Modern Electrical Installation Work |
| Author | Frederick H.Taylor |
| Notes | Plugs, selecting a plug, sizes of plugs, three-pin plugs, four-pin plugs, the switch control of plugs, pattern of plugs |