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By Raymond F. Yates

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An indestructible dental burr. At present these must be frequently replaced or reground. 572. A really humane dog muzzle that will permit the animal to eat without entire removal of the muzzle. 573. A system for speeding up the ripening of oranges after they have been picked. 574. A baseball made without seams. 575. A. simple system of locker key duplication that can be used without the necessity of sending to the manufacturer of the locks. 576. A method of opening large vaults from the inside to overcome the danger of time locks and threat of suffocation.

All of the large American cities would force the use of such equipment. 634. Development of small Diesel engines suitable for automobiles is hampered by lack of a suitable fuel injection device and by the problem of excessive weight. · 620. Magnetic building blocks for children. 635. A better and less awkward guard for circular saws. fur. An erasing key on a typewriter. 636. Ear-laps that will remain fixed to the ears without the use of steel bands. 6r9. A garbage truck without odor. The health departments of 622.

Bicycle tires. 279. A noiseless cafeteria tray that will preserve a bright, polished appearance under hard service. lumber. 281. A substitute for wooden paving bricks that will tend to produce more noiseless streets. 266. Rapid advertising transfers for glass that can be applied without danger of mishap. 282. A cheap chemical preparation that will absolutely remove the scale from a boiler and prevent its formation. 267. A rapid fire non-exploding gun built on the centrifugal 283. A way of mounting diamonds in gold so that there will be no danger of the diamond cutting the metal and becoming loose.

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2100 Needed Inventions by Raymond F. Yates


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