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Creation Date 

1. Before 1951  (2)
2. 1951 To 1958  (2)
3. 1959 To 1960  (3)
4. 1961 To 1963  (6)
5. After 1963  (1)
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Subject 

1. Transporting  (8)
2. Performing Operations  (8)
3. Auxiliary Operations Used In Connection With Metal-Workingwithout Essentially Removing Material  (5)
4. Metallurgy Of Iron  (5)
5. Modifying The Physical Structure Of Ferrous Metals  (5)
6. Railway Systems  (5)
7. Making Metal Malleable By Decarburisation, Tempering Or Othertreatments  (5)
8. Punching Metal  (5)
9. Chemistry  (5)
10. Metallurgy  (5)
11. Manufacture Of Metal Sheets, Wire, Rods, Tubes Or Profiles,otherwise Than By Rolling  (5)
12. Railways  (5)
13. General Devices For Heat Treatment Of Ferrous Or Non-Ferrousmetals Or Alloys  (5)
14. Equipment Therefor Not Otherwise Provided For  (5)
15. Mechanical Metal-Working Without Essentially Removingmaterial  (5)
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Language 

1. English  (12)
2. French  (1)
3. German  (1)
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