(57) An interlocking closure fastening device comprising an omega-shaped closure element
and a co-acting clamping closure element. The co-acting clamping closure element may
have a profile portion comprising two generally parallel arm portions wherein one
of the arm portions terminates in an inwardly curved hook portion, and the other arm
portion curves slightly inward prior to terminating in an outwardly extending clamp
portion; or the profile portion may comprise two outwardly curved arm portions wherein
one of the arm portions terminates in an inwardly curved hook portion, and the other
arm portion curves inwardly prior to terminating in a slightly outwardly curved hook
portion; or the profile portion may comprise one inwardly curved arm portion terminating
in an inwardly curved hook portion, and one generally straight arm portion.
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