SN.31R: Difference between revisions
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It could display yellow or green. | It could display yellow or green. | ||
==Abolition== | |||
When the signal was abolished it was replaced with [[UM.92]]. | |||
Latest revision as of 21:38, 8 February 2016
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Creation
This signal was brought into use in December 1970 to repeat SN.31:
It could display yellow or green.
Abolition
When the signal was abolished it was replaced with UM.92.