Who invented the plaster saw

The inventor is in dispute, as follows:

1. The inventors of a plaster saw for orthopedic use include Wang Shuren, Wang Siran, Wang Wenge, Wang Xiaoxia and Wang Tianlong. The applicant is Heilongjiang University of Traditional Chinese Medicine.

2. Another invention on gypsum saw, the patent name is: gypsum saw with gap-removing function, and its type is utility model. Its inventors are Li Dagong, Lu Renyi, Lu Guoqiang, and the patent applicant is Shanghai Xinsheng Photoelectric Technology Co.