I) DD, DT series: complete-plastic gear wheel seris, injection moulding gear wheel seris and complete-copper gear wheel seris;

II) Bi-direction, anti-reverse, anti-tamper regisiter series;
 
DD28aF
DD28 bi-direction
DD283
DD283 bi-direction DD283t bi-direction DD284 bi-direction
100 seris
100 serist bi-direction
95 seris
DD862 through hole type
DD862 bayonet Type
DD862 complet plastic gear bayonet Type
DT862Jewel Type
DD862 Jewel Type
DD862bi-direction type
DD862 bayonet 6digits big figure wheel type
DD862a bi-direction
DT
 
DD jumping figure wheel type
DD copper gear type