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Perforation gauge

Perforation gauge

a philatelic tool used to measure perforations

en-GB/ˌpɜːfəˈɹeɪʃən ˈɡeɪd͡ʒ/

en-US/ˌpɝfəˈɹeɪʃən ˈɡeɪd͡ʒ/

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philatelic accessories measurement scale measuring instrument