Also in 1906, Robert von Lieben and Lee De Forest independently developed the amplifier tube, called the triode.

A stepper is a device used in the manufacture of integrated circuits (ICs) that is similar in operation to a slide projector or a photographic enlarger.

Even here, there is another grower, you see, very interested in the bugs, the bad ones and the good ones, wearing this magnifier already on her head, just walking safely in her crop.