Centuries: 16th century - 17th century - 18th century
Decades: 1590s 1600s 1610s 1620s 1630s - 1640s - 1650s 1660s 1670s 1680s 1690s
Years: 1642 1643 1644 1645 1646 - 1647 - 1648 1649 1650 1651 1652
Events of the English Civil War
... their use as communications channels; generally an ELF signal serves to request that a submarine surface and initiate some other form of contact.
One of the difficulties ...
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