手書きで”YFB”。Yokoyama Fire Brick？
YFB耐火煉瓦@明石市魚住町
https://bdb.kyudou.org/?p=3352
Yet another brick-seals database in KANSAI Dist.
Yet another brick-seals database in KANSAI Dist.
手書きで”YFB”。Yokoyama Fire Brick？
https://bdb.kyudou.org/?p=3352