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| Picture No | 12517480 |
| Date | 1929 |
| Description | Belling electrical systems, The Parmotor Relay |
| Details |
Belling electrical systems, The Parmotor Relay, for automatically controlling electrical circuits. Showing the Relay itself, with and without cover, air thermostat, water thermostat, and temperature controls for rooms, cooking equipment and water.
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| Source | Illustration in a catalogue, Belling Electric Appliances, p71 |
| Credit | Mary Evans Picture Library |
| Restrictions |
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