Issued U.S. Patent No. 7,530,762
matgrell2019-07-01T19:19:50+00:007,530,762 Methods and apparatuses for surface finishing cured concrete A [...]
Issued U.S. Patent No. 7,531,097
matgrell2019-07-01T19:19:58+00:007,531,097 Method and apparatus for aeration of liquid medium An [...]