Centuries: 16th century - 17th century - 18th century
Decades: 1610s 1620s 1630s 1640s 1650s - 1660s - 1670s 1680s 1690s 1700s 1710s
Years: 1661 1662 1663 1664 1665 - 1666 - 1667 1668 1669 1670 1671
... of measurement for electric conductance, being the inverse of ohm, named after Werner von Siemens.
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