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lifting jacks

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Sudbury River Conduit, B.W.W., div. 4, sec. 15, Oct. 18, 1876. View of central portion of large centring showing jack screws.

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Oct. 18, 1876. View of...

Public domain image of an industrial building, factory, structure, works, 19th-20th century industrial revolution, free to use, no copyright restrictions - Picryl description

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Oct. 18, 1876. View of central portion of large centring showing jack screws.

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Oct. 18, 1876. View of...

Public domain image of an industrial building, factory, structure, works, 19th-20th century industrial revolution, free to use, no copyright restrictions - Picryl description

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Oct. 18, 1876. View of central portion of large centring showing jack screws.

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Oct. 18, 1876. View of...

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Oct. 18, 1876. View of central portion of large centring showing jack screws.

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Oct. 18, 1876. View of...

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description