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Hourglasses | 2 PPT Diagrams
age
antique
bulb
clock
countdown
equipment
falling
flow
flowing
glass
hand
history
hour
hour glass
hour-glass
hourglass
ideas
instrument
instrument of time
isolated
measurement
minute
object
old
old-fashioned
passing
past
pour
process
reflection
retro
retro-styled
revival
sand
sand glass
sand timer
sand-glass
sandglass
stopwatch
time