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ZM1020 (red filter) and ZM1022 (clear glass) are electrically
identical. The tubes are electrically equivalent to the GN4 and GR10M. |
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ZM1023 Symbol tube for electronic multimeters. |
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ZM1026 This tube contains a single '½' character, nothing else. It was probably for use in cash registers (in the early 1970s, when the UK still had a ½p coin. |
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