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Keywords:
PNEUMATIC,
TUBES,
COMMUNICATIONS,
CIRCUITS,
SYSTEMS,
TELEGRAPHY,
TELEGRAPHS,
STATIONS,
DESPATCH,
AIR,
CURRENTS,
COMPRESSED,
COMPRESSION,
JOINTS,
INSTRUMENTS,
FRAMES,
CARRIERS,
APPARATUS,
VACUUM,
EXHAUSTS,
MACHINERY,
MACHINES,
SPEED,
TRANSMISSION,
EXPERIMENTS,
LONDON,
BERLIN,
UK,
GERMANY
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© Thomas Telford and ICE
1872
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