Stamps, Multichannel Spectrometers design

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German Democratic Republic

postage

1988, Jun 21 10. Anniversary Of The Joint Space Flight USSR-DDR issue unwmk (no perf info)
Colnect-357-463-Multichannel-Spectrometers.jpgColnect-357-483-Multichannel-Spectrometers.jpg
- 10pf multi Multichannel Spectrometers
- 20pf multi Multichannel Spectrometers

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