SUBJECT
Equipment and supplies
Electronic books
113
Design and construction
73
Food service
28
Maintenance and repair
27
Sound
27
Chemical plants
26
Production and direction
23
Recording and reproducing
23
Air conditioning
21
Heating
20
Home economics
19
Philippine Atmospheric, Geophysical and Astronomical Services Administration
19
Purification
19
Radio
19
Telecommunication
19
Wireless communication systems
19
Television
18
Testing
17
Materials
16
Ventilation
16
Air
15
Congresses
15
Philippine National Police
14
Signal processing
13
Chemical processes
12
Chemical engineering
11
Fire prevention
11
Photography
11
Technological innovations
11
Elections
10
Interior decoration
10
Data processing
9
Food service management
9
Automobiles
8
Fisheries
8
Petroleum industry and trade
8
Playgrounds
8
Radio stations
8
Aquariums
7
Building materials
7
Computer-aided design
7
Corrosion
7
Digital techniques
7
Environmental aspects
7
Household appliances
7
Optical communications
7
Patient monitoring
7
Plumbing
7
Refrigeration and refrigerating machinery
7
more ...