Machine for use in implanting plant supporting stakes

Manhole with extension wings

Means for providing a vertical drain in soil

Means for providing a vertical drain in soil

Means for resurfacing tennis courts and the like

Means for securing a cover over a drainage channel

Method and apparatus for controlling drainage and irrigation...

Method and apparatus for controlling expansion and contraction o

Method and apparatus for controlling silt erosion

Method and apparatus for distributing graywater

Method and apparatus for enhancement of prefabricated earth...

Method and apparatus for enhancement of prefabricated...

Method and apparatus for handling water at low and high feed...

Method and apparatus for impounding fluids

Method and apparatus for installation of drainage field

Method and apparatus for installation of drainage field

Method and apparatus for laying drains in frost-susceptible grou

Method and apparatus for providing water for irrigating turf gra

Method and apparatus for remotely severing a prefabricated...

Method and apparatus for the hydrologic regulation of turf soil