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Institution
Item Category
Collection
Call Number
Subject
3
Air conditioning
3
Examinations
2
Air conditioning-control
2
Buildings-electric equipment
2
Electric controllers
2
Engineering
more ...
2
Heating
2
Heating-control
2
Ventilation
2
Ventilation-control
1
Automatic machinery
1
Certification
1
Examinations, questions, etc
1
Machine-tools
1
Refrigeration and refrigerating machinery
1
Welders (Persons)
1
Welding
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Year of Publication