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Prüfung
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Pennsylvania Railroad Company's drop testing machine for cast iron car wheels
Fereday and Palmer's patent stress recorder
Origin and development of the Pennsylvania R. R. testing laboratory
Because it's tested, millions travel safely -- H
Evolution of southwark-Emery testing machine
Rubber testing as evaluated by automotive engineers
Lockheed's experience with magnetic particle inspection
New replica techniques for evaluating engine wear
Machine for testing gear materials and lubricants