TY  - BOOK
ED  - American Petroleum Institute, API
TI  - Butterfly valves: double flanged, lug and wafer type, and butt-welding ends: API Standard 609
U1  - Caja 17 
PY  - 2021///
CY  - Washington
PB  - American Petroleum Institute, API
KW  - Normas API
KW  - Normalización
ER  -