"FOREWORD This amendment has been prepared by IEC technical committee 49: Piezoelectric@ dielectric and electrostatic devices and associated materials for frequency control@ selection and detection Full information on the voting for the approval of this amendment can be found in the report on voting indicated in the above table. The committee has decided that the contents of this amendment and the base publication will remain unchanged until the stability date indicated on the IEC website under ""http://webstore.iec.ch"" in the data related to the specific publication. At this date@ the publication will be ? reconfirmed@ ? withdrawn@ ? replaced by a revised edition@ or ? amended. A bilingual version of this publication may be issued at a later date."