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Description and application of the semaphore with glas panels, which is clearly visible on both bright and dark backing, no matter whether the source of light be before or behind the onlooker

Description and application of the semaphore with glas panels, which is clearly visible on both bright and dark backing, no matter whether the source of light be before or behind the onlooker

G. Maas

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OL Work ID
OL39480565W

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