共 5 条
[1]
BAYER CO, 1913, Patent No. 283107
[2]
BAYER CO, 1914, Patent No. 14371
[3]
BAYER CO, 1914, Patent No. 291162
[4]
DELBRUCK, Patent No. 1169321
[5]
Fernbach A., 1912, US Patent, Patent No. 1044368