| 1964 |
O~rp~yu {}p~yy |
| 1973 |
Hprtu r s. Nyyspp ~pp| yxrtr |
| 1976 |
O{ s|pr~z y r s. S{y |
| 1979 |
O{ ury~z u~ r s. Op{p |
| 1980 |
Npp| yxrtr qy|syu{y ys r~s }puyp|p y ys| |
| 1985 |
Npp| yxrtr uy|~s {p|u| |
| 1986 |
P|u~p |yu~xy K}yyy {~| xp |u{prp}y y ypu|~}y ruurp}y |
| 1987 |
Npp|p pxpq{p rxt~-wyt{~s }ppp. Npp| u |uu~y ~p t}. |
| 1991 |
Hpruu~ rz p pxpq{y r~s }puyp|p. |
| 1994 |
Npp| yxrtr y}|p~pp yx yp~rs |prp |
| 1994 |
Npp| yxrtr y~r t| pprp~yu ~yuz |
| 1997 |
Npp| yxrtr yrpus }puyp|p t| }y{ysyy |
| 2000 |
P|u~ uyy{p ISO9001. Npp| yxrtr utyu{y y}|p~p~r yx yp~rs |prp |
| 2001 |
P|u~ uyy{p EN46001 t| RE-}p{yr{y |
| 2003 |
P|u~ uyy{p ISO13485 t| tp|~uzuz RE-}p{yr{y |
| 2005 |
O~rp~p ~p~ y|utrpu|{p y ~ {~{{p |pqpy (Keisei Engineering Co.) |
| 2006 |
O{ ury~z u~ r s. Ru~tpz |
| 2008 |
Hprt r s. Nyyspp xpruy| pxpq{ qy|syu{y ys }puyp|p |