The paper clip was invented in 1899 or 1890 by a Norwegian patent clerk called Johann Vaaler. His original paper clip was a thin spring-steel wire with triangular or square ends and two "tongues." Vaaler patented his invention in Germany and later in the USA (1901). The modern-shaped paper clip was patented in April 27, 1899 by William Middlebrook of Waterbury, Connecticut, USA.
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