EN 61240:1997 Piezoelectric Devices - Preparation of Outline Drawings of Surface-Mounted Devices (SMD) for Frequency Control and Selection - General Rules
2017EN 61240:2017 Piezoelectric devices - Preparation of outline drawings of surface-mounted devices (SMD) for frequency control and selection - General rules
2012EN 61240:2012 Piezoelectric devices - Preparation of outline drawings of surface-mounted devices (SMD) for frequency control and selection - General rules
1997EN 61240:1997 Piezoelectric Devices - Preparation of Outline Drawings of Surface-Mounted Devices (SMD) for Frequency Control and Selection - General Rules