The first class of medical devices for the record voucher number is organized as follows: × 1 械备 ××××2××××3 number. Where: × 1 for the record department of the location of the abbreviation: imported Class I medical devices for the "country"; domestic Class I medical devices for the record department of the location of the province, autonomous region, municipalities directly under the Central Government for the abbreviation of the location of the municipal administrative region (without the corresponding municipal administrative region, only for the abbreviation of the province, autonomous region, municipalities directly under the Central Government) ××××2 for the record year; ××××3 for the record of the water number