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Remington made this model using a modified version of the noiseless mechanism. The mechanism looks at first glance like a regular noiseless machine, but when using it, the clatter from the typebars striking the platen is obvious.  The mechanism is adjusted for the typebars to strike like a normal typewriter does – the weights that [...]

Corona continued it’s line of light-weight portable typewriters, producing the Model 4, which differed from the Model 3 mainly in that it did not fold for transport. The Model 4 was continued after the merger with L.C. Smith and until production was stopped in 1942 for the war. The Corona 4 used Dupont’s Duco lacquer [...]

This formula is a universal developer for all projection and contact papers. It gives black tones with excellent brilliance and detail. Agfa 130 provides unusual latitude in development and is clean-working even with long developing times.

Agfa says this fine-grain developer keeps well and makes an excellent tank developer.

Amidol is well known as a print developer. In fact, I use it myself.  But it is also a film developer, as this article from The American Annual of Photography published in 1938.