I'm sure that you are all aware how quickly technology gets outdated. The FDC I acquired recently illustrates this very well.
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| Great Britain - Information Technology, 8 Sept 1982 |
You will appreciate this more when you look at the individual stamps.
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| Development of Communications |
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| Modern Technological Aids |
I don't think I need to explain anything else.
From 1939 when Germany occupied Czechoslovakia, the country was split into Bohemia and Moravia.
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| Czechoslovakia: Bohemia - 1939 |
The stamp shows the ironworks at Moravska-Ostrava.
A stamp from South Africa depicts
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| South Africa - 1961, Western Deep Level Mine |
The mine is located in the West Wits gold field and then was said to be the world's deepest.
For technological/industry examples follow the links at Violet's Sunday-Stamps-II-40.