Stevens, Davis, Miller & Mosher
Irrigation hose
 In an irrigation hose which is produced by melt-sticking double thermoplastic resin film in a plane along longitudinal parallel lines so as to form 2 to 3 passages, one a supply passage and others being constant pressure passages, the supply passage being connected to each constant pressure passage by communicating holes which are formed by non-melt-stuck portions spaced in the melt-stuck line between both passages, and the constant pressure passage having water-irrigating holes which are formed by non-melt-stuck portions spaced in an outside melt-stuck line thereof, the improvement which comprises making small melt-stuck portions in the vicinity of the communicating holes and/or water-irrigating holes. 
Sumitomo Chemical Company, Limited
A
A01G
inventional
Susumu Toshio Shigeharu Takami Junji
Kojimoto Mori Suzuki Sato Ono