Copyright © Philip M. Parker, INSEAD. Terms of Use.

| Year | Description |
| 1998 | Invention patented by Ronald J. Gallenberg on August 27th, 1998. Abstract: A method and apparatus for cleaning beaches or other similar sandy areas which includes a digger chain and an associated sweeper chain for capturing debris and other articles and conveying the same to a collection box or separation conveyor. |
| Source: selected by the editor from original sources. | |
Copyright © Philip M. Parker, INSEAD. Terms of Use.