Plunger with door knob on the end of the handleComplete Patent Searching Database and Patent Data Analytics Services.doi:USD466658 S1Van Dam, GayleUS
doi:DE4114988 A1THIESS IRMGARDRATHMANN KLAUSDEDE4114988A1 * 1991年5月8日 1992年11月12日 Vdo Schindling Motor vehicle door lock - has connection of door knob-plunger via micro-switch to two way pump operating door locks