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made with [[BNC connector]]s for the external trigger inputs. Prior to 1963, the external | made with [[BNC connector]]s for the external trigger inputs. Prior to 1963, the external | ||
trigger inputs used [[UHF connector]]s. 1972 was the last year that any version of the 535 was sold. | trigger inputs used [[UHF connector]]s. 1972 was the last year that any version of the 535 was sold. | ||
In | In 1973, the 54x series was still available, but nothing from the 53x series. | ||
The first 535s had brown slide-out cases, then blue slide-out cases, and finally | The first 535s had brown slide-out cases, then blue slide-out cases, and finally |
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