円柱の上部の眺め.円柱の中に桁を差し込む方法を示す/(Top view of circular pillar. Showing the manner in which cross-beams are inserted in to it)
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  • 円柱の上部の眺め.円柱の中に桁を差し込む方法を示す/(Top view of circular pillar. Showing the manner in which cross-beams are inserted in to it)

円柱の上部の眺め.円柱の中に桁を差し込む方法を示す/(Top view of circular pillar. Showing the manner in which cross-beams are inserted in to it)

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