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Semi-indirect lighting with a new unit practical for any purpose : that is more efficient than any other lighting unit on the market (1920)

Luminous Unit Co. · Luminous Unit Co. · leaf 6

An illustration from Semi-indirect lighting with a new unit practical for any purpose : that is more efficient than any other lighting unit on the market, 1920, leaf 6
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Electrical engineering · Lighting · Interior lighting · Lighting Fixtures

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