Aut cum scuto aut in scuto
I especially like the air-cooling assist feature.
Is that a second engine behind the battery? What 'assist' cools that?
Might be an air compressor, maybe.
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Found in an abandoned Gold Mine in Northern California in the late 1970s, the Davis Motor Mine Cart is a home built creation using most of a 1926 Harley Davidson 21c.i. B-Model motorcycle. The machine also features a Ford Model-A transmission, and electric start. From the www.
Using a gas engine in a mine shaft...ode to carbon monoxide.
That's at "Wheels Through Time"