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Scherzer rolling lift bridges : their inception, development and use. (1916)
Scherzer Rolling Lift Bridge Co. · Scherzer Rolling Lift Bridge Co. · leaf 24
visible a- when the bridges were first put in service.More than this need not be -aid.Bridges · Lift bridges · Rolling bridges
Internet Archive · Building Technology Heritage Library · Public Domain Mark 1.0. Free to use for anything.
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