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Do Rotary Engines Have Valves? Here's How They Work
As a result, they are considered more efficient by some metrics and require fewer moving parts to function. The first rotary engines were primarily used for aircraft during World War I ...
Hackaday8y
Rotary Cell Phone: Blast From A Past That Never Was
The 1970s called and they want their rotary dial cell phone back. Looking for all the world like something assembled from the Radio Shack parts department – remember when Radio Shack sold parts?