Sir,
The Britannica quote is not very well written
Quote:
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In the 1960s, optical range finders began to be replaced by laser range finders. In combination with electronic ballistic computers, these greatly increased the hit probability of tank guns. They became standard in all new tanks built from the early 1970s and were retrofitted in many of the earlier tanks.
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I take that to mean that LRF and electronic ballistic computers were not standard issue before 1970.