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Penna. Railroad Signal Linens

39-S
Circuits for Electro-Pneumatic
Automatic Home & Distant Signals

1904


200-S4
Mechanical Interlocking Machine

1909


229-S1
Diagram Showing
Rocking Shaft Leadout Construction

1910


239-S
Standard Semaphore Spectacles

1910


252-S1
Typical Arrangement of Mechanical Signals
Operated by Machine and Ground Levers

1911