U47
https://www.snrec.jp/entry/product/neumann_u47
https://mit-studio.com/archives/2616
https://www.snrec.jp/entry/productreview/2014/04/44411
U67
https://neumannjapan.com/neumann.user.ItemDetail/id/186.html
M147
https://neumannjapan.com/neumann.user.ItemDetail/id/3.html
U87
https://neumannjapan.com/neumann.user.ItemDetail/id/13.html
U47fet
https://neumannjapan.com/neumann.user.ItemDetail/id/175.html