计时仪表 meaning in English

hourmeter instrument

Timekeeping instruments - movements - forms , dimensions and nomenclature
计时仪表.机芯形状尺寸和名称
Timekeeping instruments - conditions for carrying out checks on radioluminescent deposits
计时仪表.对辐射发光沉积物进行检验的条件
Radioluminescent deposits used for horological instruments ; terms , requirements , testing
计时仪表用的放射性发光附着物.术语要求检验