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Type O was [[introduced in 1962|introduced in mid-1962]] and it was | Type O was [[introduced in 1962|introduced in mid-1962]] and it was | ||
available | available until the discontinuance of the entire 500-series scope line in 1974. | ||
The Type O can be used with any of the following adapters: | The Type O can be used with any of the following adapters: | ||