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Completion of an Important Improvement - p113
doi:10.1038/scientificamerican12231854-113d
London Smoke—Its Use to Purify the Air - p115
doi:10.1038/scientificamerican12231854-115b
On the Patentability and the Patenting of Inventions - p117
doi:10.1038/scientificamerican12231854-117b
