Science: The Path of Progress: Mar. 27, 1939

Inventions for which patents have recently been granted by the U. S. Patent Office:

>Hydraulic brakes for bicycles.

>Inflated rubber furniture which can be deflated for storage in a small space.

> A calf weaner (a pronged harness which jabs a cow when her calf attempts to suckle, thereby inducing her to object).

> A mousetrap which lassoes mice.

> A humane rattrap which shoots a dart through a rat.

> A toothbrush equipped with suction cups for withdrawing food particles from crevices.

> A moneybag which, when snatched from a messenger's hand, administers an electric shock...

Want the full story?

Subscribe Now


Get TIME the way you want it

  • One Week Digital Pass — $4.99
  • Monthly Pay-As-You-Go DIGITAL ACCESS$2.99
  • One Year ALL ACCESSJust $30!   Best Deal!
    Print Magazine + Digital Edition + Subscriber-only Content on

Learn more about the benefits of being a TIME subscriber

If you are already a subscriber sign up — registration is free!