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next longest life
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then shortened to Type D in 1959 with the introduction of the 5xxA scopes. Its last year was 1968, having been superseded | then shortened to Type D in 1959 with the introduction of the 5xxA scopes. Its last year was 1968, having been superseded | ||
by the constant-bandwidth model [[1A6]]. | by the constant-bandwidth model [[1A6]]. | ||
[[K]], [[L]], and [[T]] are tied for longest production life, at 16 years. | |||
[[B]], [[D]], and [[G]] are next at 15 years. | |||
[[Lavoie Laboratories]] produced an unauthorized clone, the [[Lavoie LA-265-D]]. | [[Lavoie Laboratories]] produced an unauthorized clone, the [[Lavoie LA-265-D]]. | ||