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postage

1991, May 14 Europa 1991 issue - space technology unwmk p. 11.5

X	50	multi	Ariane fairing
X	90	multi	Giotto probe

semipostal

1991, May 14 Pro Patria 1991 issue (no perf info)

-	50+20	multi	by Wolf Barth
-	70+30	multi	by Helmut Federle
-	80+40	multi	by Matthias Bosshart
-	90+40	multi	by Werner Otto Leuenberger

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