Stamps of Germany, oscillogram pulses design

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postage

1980, Jul 10 unwmk p. 14
DBP_1980_1053_Internationaler_Kongre%25C3%259F_f%25C3%25BCr_Erziehung_und_Bildung_H%25C3%25B6rgesch%25C3%25A4digter.jpg
X 90 multi oscillogram pulses

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