首页>
外国专利>
at the same time clock indicating time in major cities of the northern hemisphere and southern reported on two dials between the fixed time is indicated on the transparency with two discs subjectthe clock displays also can fully nit rotary position changing of the two hemispheres in relation to the sun in 24 hours
at the same time clock indicating time in major cities of the northern hemisphere and southern reported on two dials between the fixed time is indicated on the transparency with two discs subjectthe clock displays also can fully nit rotary position changing of the two hemispheres in relation to the sun in 24 hours
