Table of contents
Recently Patented Inventions
Business and Personal
Notes and Queries
Index
Patent Notes
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An Annunciator for Burglar Alarms, Etc. - p306
doi:10.1038/scientificamerican11141891-306a
A Proposed “Whaleback” Passenger Steamer - p309
Harold Avery
doi:10.1038/scientificamerican11141891-309
A Twin Screw Launch Run by a Compound Engine - p311
doi:10.1038/scientificamerican11141891-311