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Date: |
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Description: | This is a quick break switch, made after J. H. Holmes's patent. It is made of wood, which is a good insulating material. What makes this switch special is the detachable handle. It serves as a key, so that only the authorised person who has the key can use the switch.
Part: base & cover, Material: wood
image | Source: | Tyne & Wear Archives & Museums | Identifier: | emu.ecatalogue.science&industry.482430 | Go to resource |
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