No definitions found for 'vacuum phototube'
Perhaps one of these:
vis impressa,
vacuum pan,
vacuum bomb,
vacuum pump,
vacuum bottle,
vaginopennous,
vacuum bag,
vaso-inhibitory,
vacuum brake,
vaishnavism,
vaccine point,
vaishnava,
vacuum flask,
vision purple,
vaisnavism,
vax mips,
vacuum valve