방음구조

Sound Insulation Construction

방음문

Sound Insulation Door, Sound Proof Door

방음재

Sound Proof Material

방잠망부설선

Net Layer

방전

Discharge

방전 충격용접

Percussion Welding

방청도료

Anti-corrosive Paint

방충격벽

Splinter Bulkhead

방충망문

Insect Net Door, Mosquito Net Door

방파체

Breakwater