| http://www.w3.org/ns/prov#value | - In constructing an explosion-engine in accordance with this invention two cylinders are placed one in line with another, with two pairs of related pistons therein, one piston of each pair in one of said cylinders and the other in another of said cylinders, one of these pistons in its cylinder and one of them in the other cylinder being relatively immovable, there being an operative connection of u
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