Science: Path of Progress

Among inventions patented in recent weeks at the U. S. Patent Office:

> An invisible hearing aid for the deaf, built entirely within a set of false teeth.

> A set of "police claws" to mount on the front bumper of a patrol car, grab a speeder's rear bumper.

> A muff for cornets and trombones, to fit over the keys, keep outdoor musicians' hands warm in winter. Also an electrically heated steering wheel to warm motorists' hands.

> A mailman's umbrella with slotted handle, to clip on the edge of a mail bag.

> A barber's vacuum tube that fits around customers'...

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