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1. Before 1960  (3,406)
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Subject 

1. Systems For Controlling Or Regulating Non-Electric Variables  (138,686)
2. Engineering Elements And Units  (57,823)
3. Thermal Insulation In General  (57,823)
4. General Measures For Producing And Maintaining Effectivefunctioning Of Machines Or Installations  (57,823)
5. Actuating-Floats  (43,400)
6. Cocks  (43,400)
7. Devices For Venting Or Aerating  (43,400)
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