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I finally remembered what it was that this block reminded me of. The History Channel did a story on radar development. While the Brits came up with a way to make it work, they could not manufacture an intricate part (looking much like Ben's block) in mass quantities. A US engineer came up with the idea of stamping thin sections and bonding them together to build the required height.
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That would be the Magnetron oscillator, and they sorta look like the attached picture. However the newer magnetrons that we have in our microwave ovens looke like a hybrid between the RADIUS and the magnetron in the picture.
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