Stamps of Portugal, 11 Apr 1973

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postage

1973, Apr 11 Productivity Conference '72 issue unwmk p. 14.5
Colnect-172-826-Graph-and-computer-tapes.jpgColnect-172-827-Statistic-Numbers.jpgColnect-172-828-Statistic-Curves.jpg
- 1e multi graphs
X 4e multi odometer
X 9e multi

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