File:Blathy wattmeter.jpg

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DescriptionBlathy wattmeter.jpg Bláthy's wattmeter in 1889 Date 1889 Source en:File:Blathy_wattmeter.jpg Author Unknown authorUnknown author Permission

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DescriptionBlathy wattmeter.jpg Bláthy's wattmeter in 1889 Date 1889 Source en:File:Blathy_wattmeter.jpg Author Unknown authorUnknown author Permission