| http://www.w3.org/ns/prov#value | - The lids shown in the drawings are made, as lids of this general sort commonly are, by subjecting a thin, initially flat, planar sheet of thermoplastics material to a forming process, such as a vacuum forming or pressing process, whilst it is at a temperature at which it is readily plastically deformable, the effect of the process being to displace some of the material of the sheet to predetermine
|
