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Stockphotos.ro (c) 2025. All stock photos are provided by Dreamstime and are copyrighted by their respective owners.
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| navigate by keyword : backround ball blackboard board calculus chalk charge class classroom college current detail device discharge drawing education electrical electricity electron electrostatic energy equipment experience formula generator graaff influence instrumentation machine math measurement metal object old one physical powerful school science sign solution stainless static technical tool volt voltage voltages white wimshurst |
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| Wimshurst influence Machin, formula written on blackboard in background; close up |
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Stockphotos.ro (c) 2025. All stock photos are provided by Dreamstime and are copyrighted by their respective owners. |
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