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Creation Date 

1. Before 1974  (4)
2. 1974 To 1982  (5)
3. 1983 To 1997  (4)
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5. After 2002  (10)
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Subject 

1. Displaying  (10)
2. Labels Or Name-Plates  (10)
3. Signs  (10)
4. Educational Or Demonstration Appliances  (8)
5. Planetaria  (8)
6. Appliances For Teaching, Or Communicating With, The Blind,deaf Or Mute  (8)
7. Electricity  (8)
8. Diagrams  (8)
9. Globes  (8)
10. Pictorial Communication, E.G. Television  (7)
11. Electric Communication Technique  (7)
12. Code Conversion In General  (5)
13. Basic Electronic Circuitry  (5)
14. Coding  (5)
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Language 

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2. Dutch  (12)
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4. German  (3)
5. Spanish  (2)
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