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Keywords from Image Description:
Concrete boat Hans Martin. Hans Martin allegedly world's second oldest concrete boat Porsgrunn Norway Built Betongbten Hans Martin Porsgrunn Bygger Tonnasje bruttotonn Lengde ' Fikk status som verneverdig skip Bygd Porsgrund Cementstperi Konstruert av stlarmert betong av ingenir Harald Alfsen Ble gitt som gave fra sivilingenir