Basic electricity:direct current : symbols-diagrams and circuits-english
- Crowborough : Audio Visual Source, [19__]
- Videocassette; 19cm.
- Bergwall Production .
VHS/NTSC
20040000376
Electricity--measurement
Symbols,diagrams and circuits
VHS/NTSC
20040000376
Electricity--measurement
Symbols,diagrams and circuits
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