sight hole /INDUSTRY,INDUSTRY-METAL/
[DE] Maschinenfenster; Schaulöcher
[EN] sight hole
[FR] trous Devillez(B)
inspection hole,sight hole /INDUSTRY-METAL/
[DE] Schauloch
[EN] inspection hole; sight hole
[FR] regard
bye hole,observation hole,peep hole,peephole,sight hole /INDUSTRY,ENG-MECHANICAL/
[DE] Beobachtungsöffnung; Guckloch; Schauloch
[EN] bye hole; observation hole; peep hole; peephole; sight hole
[FR] lunette(B); mouchard; regard