Siren

This electronic siren was sold as coming with “a pulsating, intense woo-woo-woo-sound”.

Never forget1970

Magnifier

The magnifier allowed the home photographer to make copies in all sizes. (From the catalogue 1978.)

Because I want one1920

Loupe

This practical little magnification device could be folded, making it even smaller, so you could put it in your pocket. (From the catalogue 1924.)

Do-it-yourself1930

Adjustable wrench

During a prison stint in 1922, the first black heavy-weight boxing champion, Jack Johnson, invented a version of the wrench. He was in prison for marrying a white woman. Together with the Swede Johan Petter Johansson, Jack Johnson was one of three people to patent similar products. The earliest drawings of a wrench are from the 1400s and were found in Germany. (From catalogue 1930.)