BIBLIO
BIBLIO
BIBILO
The existence of electrical energy to be very important for the implementation of national development, both directly and indirectly. Electrical energy must be fulfilled because it is very importan…
Cooling machine technology that uses CFC (Cloro Flouro Carbon) can damage the Ozone layer structure. Therefore, it is important to invent a cooling machine/refrigerator that does not use CFC. One o…
Biblio