 Light-Signal Apparatus, US952420A by Gustaf Dalén (source code)

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= Light-Signal Apparatus, US952420A by Gustaf Dalén
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{tag=Work by Gustaf Dalén}
{title2=1910}

Inventor: <Gustaf Dalén>. US952420A, filed 4 January and published 15 March 1910. Describes grouped flashing apparatus. Google Patents hosts the specification.

https://patents.google.com/patent/US952420A/en

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