ARG2-EXT: period length of the wave (usually ft or m)

https://w3id.org/framester/pb/data/role/wave-03/period-length-of-the-wave <https://w3id.org/framester/pb/schema/Role>

period length of the wave (usually ft or m) @en
period length of the wave (usually ft or m)  @en
ARG2-EXT: period length of the wave (usually ft or m)  @en

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