tank-gunner's periscope
坦克炮手潜望镜

• tubular gas lens
• tubular inside micrometer
• tubular lamp
• tubular level
• tumbler
• tumbler gear
• tumbler switch
• tumbling
• tunability
• tunable
• tunable birefringent crystal
• tunable coherent light source
• tunable DFB laser
• tunable diode laser spectroscopy
• tunable dye laser
• tunable e-beam laser
• tunable filter
• tunable ir diode laser
• tunable laser
• tunable laser oscillator
• tunable laser source
• tunable metal film filter
• tunable optical bandpass filter
• tunable organic dye laser
• tunable Raman laser