What does OPB stand for?

OPB stands for "One-Piece Building"

How to abbreviate "One-Piece Building"?

"One-Piece Building" can be abbreviated as OPB

What is the meaning of OPB abbreviation?

The meaning of OPB abbreviation is "One-Piece Building"

What does OPB mean?

OPB as abbreviation means "One-Piece Building"