Innovated doorbell system/

Bacagan, Rizalde F.,

Innovated doorbell system/ Rizalde F. Bacagan, Ma. Rowena B. Sto Domingo, Vanessa G. Vasquez - Nabua, Camarines Sur : Camarines Sur Polytechnic Colleges ; 2005. - 52 leaves.

Undergraduate Thesis (BSECE) - Electronics Engineering