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‘Patent Office’ historical pictures (exact matches)
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Patent-Office, Washington, D C – Examiners at Work
Ball in Honour of President Lincoln in the Great Hall of the Patent Office at Washington, from the Illustrated London News
Otto and Crossley Gas Engine, Patent Model
Model Hall, Patent Office
New Wing, Patent Office
Reid Gyroscopic Engine Governor, Patent Model
Bartlett Poppet Valve Gear, Patent Model
Patent Office