{TAIL ~ Such panel structures} typically consist of synthetic resin, and examples are foamed or gas expanded polystyrene, and foamed or gas expanded polypropylene, formed as molded and curved blocks or {HEAD ~ sections} that interfit end to end, as for example is shown in FIG 7, and may be adhesively bonded together at their interfit locations 
{ TAIL ~ Such panel structures } typically consist of synthetic resin , and examples are foamed or gas expanded polystyrene , and foamed or gas expanded polypropylene , formed as molded and curved blocks or { HEAD ~ sections } that interfit end to end , as for example is shown in FIG 7 , and may be adhesively bonded together at their interfit locations
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