John Postl dumbbells which weigh about 10 lbs each. The patent was granted in 1935. He said in the patent that there is a novel means for holding the plates which included a threaded extension. 
One thought on “JOHN POSTL DUMMBELLS”
Comments are closed.
Hmmm, very similar in design and patent to Jowett institute silent dumbbells of June 12 , 1928. Wonder what was different enough to get patent in 1935. I recently bought a set of Jowetts and their curved, dished plate design and thumbscrew plate hold to a cast finger grooved hand grip type handle was quite unique……. I thought. R Sorin