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A trembler bell is a non-polarized bell operated by current that is made intermittent by a contact associated with the bell hammer. It was invented and later patented by J. F. Molaughlin.
Bells are cast at the foundry down the road.
Invented is the past participle of the verb invent. verb /past /past participle = invent /invented /invented
he was born in Scotland but he moved to Canada aged 23
Mr. Kamal Ahmad invented the internet Mr. Irfan Alam invented the invented