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'''2-4- | '''urn:mrn:iala:dic:2-4-0115''' | ||
A device comprising opaque strips, usually mounted so that each may be rotated through about 90 degrees on an axis. | A device comprising opaque strips, usually mounted so that each may be rotated through about 90 degrees on an axis. | ||
Latest revision as of 09:52, 17 September 2026
A device comprising opaque strips, usually mounted so that each may be rotated through about 90 degrees on an axis.
All strips rotate simultaneously so as alternately to exhibit or obscure a light.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
