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Title

Description

Wyman-Gordon 50,000-ton Hydraulic Forging Press

Worcester, MA

One of the world's largest fabrication tools, influencing aviation and aerospace technology
Xerography

Columbus, OH

Early models of revolutionary dry-copying process.
Zhaozhou (or Anji) Bridge

Zhaoxian, Hebei

This segmental stone arch, built between 595 and 605 AD with a span of 37 meters, has double arch spandrels, and is the earliest known bridge with this type of construction.
Zuiderzee Enclosure Dam

Zaandam, North Holland

This structure, built from 1927 to 1932, has successfully barred the sea for over fifty years. The Zuiderzee closure protects a large area north of Amsterdam, and has allowed...