http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Tiêu chuẩn Nhà nước : Côn của trục chính và trục gá phần đầu trục chính mài bàn chữ nhật và bàn tròn của máy cắt kim loại rãnh chữ nhật ,gá dụng cụ: TCVN2131-77 / TCVN2135-77 ; TCVN2137-77 / TCVN2138-77