English translation for "sightglass"

观察窗
观察孔
监视孔
窥镜

Similar Words：

"sightcheck" English translation, "sighted" English translation, "sighted direction" English translation, "sighted point" English translation, "sighter" English translation, "sightglasswithoutnozzle" English translation, "sighthead" English translation, "sightholder" English translation, "sighthole" English translation, "sighthound" English translation