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69. The expert from GTB presented a status report of the GTB Working Group activities (GRE-71-33, GRE-71-34, GRE-71-35 and GRE-71-36). |
GRE-71-36 | Triangular Retro Reflector: Need for GRE advice
GRE-71-33 | GTB Working Group on Signal Lighting: Status Report
GRE-71-34 | GTB Working Group on Light Sources: Status Report
GRE-71-35 | GTB Working Group on Installation: Status Report
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