Wood, William Wallace The Walschaert And Other Modern Radial Valve Gears For Locomotives: A Practical Treatise On The Locomotive Valve Actuating Mechanism Invented By Egide ... Its Evolution Into The Mechanically Correct

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The Walschaert And Other Modern Radial Valve Gears For Locomotives: A Practical Treatise On The Locomotive Valve Actuating Mechanism Invented By Egide ... Its Evolution Into The Mechanically Correct