There are a huge number of Cannabis devices parents. Many of these deal with the processing of Cannabis into medications, industrial but also cultivation and other things. Here are a few of the more historical ones we have so far uncovered but you can also search Patents for Cannabis, Marijuana and Hemp and find thousands of patents.
1,332,908 Percolating and Concentrating Apparatus patented March 3 1920 J.U. Lloyd US1332908
808,997 - Concentrator for Solutions patented Dec 13, 1904 J.U.Lloyd US808997
777,115 - Concentrator for Solutions patented Dec 13, 1904 J.U.Lloyd US777115