Isometric type exercising device
作者： Jr Harry L Morrill
DOI:
关键词:
摘要:
lens.org 参考文章(3)
Merrill A Portman, Push and pull exercising device ,(1959)
Sicherman Gerald, Tug of war game apparatus ,(1963)
Walderma C Schaufler, Electrical exercising apparatus. ,(1908)