3 Свободни изкуства за Steam Engines With Poppet Valves

Beam engine cylinder with double-beat valves (New Catechism of the Steam Engine, 1904)
V-4 steam autocar engine (Rankin Kennedy, Modern Engines, Vol III)
Sentinel steam waggon engine (Rankin Kennedy, Modern Engines, Vol V)
1 - 3 z celkového počtu 3
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