Regulators for dynamos and motors.
Three devices for utilizing vibrations beyond the ultra violet.
A great variety of methods for coating incandescent lamp filaments with silicon, titanium, chromium, osmium, boron, etc.
Several methods of making porous filaments.
Several methods of making squirted filaments of a variety of materials, of which about thirty are specified.
Seventeen different methods and devices for separating magnetic ores.
A continuously operative primary battery.
A musical instrument operating one of Helmholtz's artificial larynxes.
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