Rudolph N.J. Draaisma was an engineer (high school diploma), and spent his professional career in this capacity. As such, it is not to be wondered at that he had many inventions. Unfortunately many never left the drawing board, and perhaps much due to his wish to sell these ideas – and his fear that they might be stolen if presented in full to potential buyers. In later years, after retirement and with a steady income from his pension, all he really wanted was recognition. Whether or not these inventions have any commercial value is not known, but they will be published here for anyone to do with as they like.
– Curator