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When copper wire is wrapped around an iron rod and connected to a battery, it becomes an electromagnet. A science teaching material movie that explains the principle and structure of electric bells and telephones by applying the principle of an electromagnet through a fusion of live action and animation.
Runtime: 11 minutes
Release: Apr 30, 1931
IMDb: 2.00/10 by 1 users
Popularity: 1
Country: Japan
Language:
Budget: 0
Revenue: 0
Keyword :
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