561: Difference between revisions

561 (view source)

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	The 561 is a [[560-series_scopes\|560 series scope]] that was [[introduced in 1961]] and		The 561 is a [[560-series_scopes\|560-series scope]] that was [[introduced in 1961]] and
	produced in various versions well into the 1970's.		produced in various versions well into the 1970's.