Subjects: ELECTRICITY; INVENTIONS
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Subjects: INVENTIONS; DAYLIGHT saving; UNITS of time
Subjects: SCIENCE; TECHNOLOGICAL innovations; INVENTIONS
Subjects: INVENTIONS; STIRRUPS; EQUESTRIANISM equipmentCHINA
Subjects: INVENTIONS; FLYING machines; FLYING automobiles
Subjects: INVENTIONS; OTTO, Nicolaus August, 1832-1891; INTERNAL combustion engines