Sand timer. This device is used to measure a set period of time by the flow of sand (blue) from one chamber to the other through a narrow gap.
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Details
Creative#:
TOP10190230
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
N/A
Property Release:
N/A
Right to Privacy:
No
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