The present invention discloses a process to produce staggered dent profiled material sheets in response to the application of either excess pressure or underpressure. A rectangular, staggered dent-profiled structure is achieved when a material sheet, in curved form, is supported by regularly spaced-apart...http://www.google.es/patents/US5887470?utm_source=gb-gplus-sharePatente US5887470 - Method and apparatus for dent profiling
