This PDF about Dentaroid aka Hanako Showa 2 highlights the previous projects of theirs
https://www.u-presscenter.jp/item/7132.pdf
https://www.u-presscenter.jp/item/7132.pdf
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Img. 1 source: http://www.mech.kogakuin.ac.jp/ms/reserch/detail_takanobulab
Img. 2, 3 source: https://www8.cao.go.jp/cstp/sangakukan/sangakukan2007/tenji/booth/20235
Source: https://www.dailymotion.com/video/x36rqdc