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Creation Date 

1. Before 1951  (2)
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Subject 

1. Transporting  (8)
2. Performing Operations  (8)
3. Engineering Elements And Units  (7)
4. Thermal Insulation In General  (7)
5. General Measures For Producing And Maintaining Effectivefunctioning Of Machines Or Installations  (7)
6. Vehicles In General  (6)
7. Physics  (4)
8. Manufacture Or Storage Of Ice  (3)
9. Shock-Absorbers  (3)
10. Liquefaction Solidification Of Gases  (3)
11. Refrigeration Or Cooling  (3)
12. Means For Damping Vibration  (3)
13. Combined Heating And Refrigeration Systems  (3)
14. Springs  (3)
15. Heat Pump Systems  (3)
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Language 

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