Wolja Saraga’s proposal for a photo-electrical instrument in 1932 from the HHI archives

Wolja Saraga's proposal for a photo-electrical instrument in 1932 from the HHI archives

Wolja Saraga’s proposal for a photo-electrical instrument in 1932 from the HHI archives

Wolja Saraga’s proposal for a photo-electrical instrument in 1932 from the HHI archives

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