I`ve never seen this logo before. Actually, I`ve never paid attention to squat toilet logos before. One reason is the position; normally when you use a squat toilet, you can`t see this part of the toilet, right?
According to a blog* about toilets in Aichi Prefecture (nice hobby! lol), the Yamahiro Ceramic Company was founded in 1925 in Seto City, and was still around in 1974, but may not exist anymore.
English Language Point:
- I`ve never... = I`ve never...before (私は。。。したことがない)