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early plug-in that did not go through the awkward "53x/54x" phase. | early plug-in that did not go through the awkward "53x/54x" phase. | ||
In 1959 it became Type G with no further change in design. It was dropped after 1970. | In 1959 it became Type G with no further change in design. It was dropped after 1970. | ||
[[K]], [[L]], and [[T]] are tied for longest production life, at 16 years. | |||
[[B]], [[D]], and [[G]] are next at 15 years. | |||
Types G and [[K]] are the only letter-series plugins | Types G and [[K]] are the only letter-series plugins |
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