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It was introduced in 1959. | It was introduced in 1959. | ||
The scope was intended to operate in an environment of strong electromagnetic fields. | The scope was intended to operate in an environment of strong electromagnetic fields. | ||
It does not take plug-ins. The power supply is external, like the 517, 551, and 555. | It does not take plug-ins. The power supply is external, like the [[517]], [[551]], and [[555]]. | ||