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(Compare also the Hungarian [[TR-4658]].) Unlike the 7603, the S1-91 only has a 1 cm graticule size. | (Compare also the Hungarian [[TR-4658]].) Unlike the 7603, the S1-91 only has a 1 cm graticule size. | ||
These scopes were designed at Vilnius Research and Development Institute of Radio Measuring Instruments (Lithuania). | These scopes were designed at [[Vilnius Research|Vilnius Research and Development Institute of Radio Measuring Instruments (Lithuania)]]. | ||
However, they are not directly compatible with Tektronix plugins since mechanical parts and connectors use metric sizes. | However, they are not directly compatible with Tektronix plugins since mechanical parts and connectors use metric sizes. |