Horn-u-Copia's Display of Makers

They received a patent, BRIT. PAT. 486345. was applied for on March 17th, 1937 by Heinrich Hermann Dick from German Markneukirchen. It refers specifically to the hexagonal valve casings and the solid valve block, and also mentions the valve heads being screwed inside the valve casings and the pistons provided with a projection registering in a groove in the casing. ¹

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