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 Telecommunications Object Thesaurus Term

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duct motor

duct motors

Initial Reference:
BT Museum - List of Simple Names (1985)

Broader term:

Scope notes:
Self-activating pneumatic device consisting of two spherical bladders on a connecting piston mechanism. Sequential inflation of the bladders and extension/contraction of the piston, so to speak, walked the device through and otherwise empty underground duct, pulling behind it a draw rope.


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