- Fort Mason
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37.807847, -122.428314 (OpenStreetMap, Google Maps, Yandex Maps)
- Black point battery. The cannon facing the Golden Gate.
- Write down the date of patent on the gun carriage (in a format as written there).
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Dec 1st 1857
Present in routes of categories Griffin
Passed by: 3/4 (75%).
By categories:
- Griffin: 3/4 (75%)