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Recently Patented Inventions
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An Important Supreme Court Decision - pp64 - 65
doi:10.1038/scientificamerican02021889-64a
The Electric Blowpipe - p68
Samuel Sheldon, Ph.D
doi:10.1038/scientificamerican02021889-68
Simple Experiments in Physics - pp71 - 72
Geo. M. Hopkins
doi:10.1038/scientificamerican02021889-71