> The principle would be similar to the
> mast-climbing platform described by Peter Epperly
> (see my response to him under separate cover).

OOPS!  Of course I meant the mast-climbing platform
described by Ken Johnson.  Sorry about the confusion -
sometimes I hate Yahoo!'s email system ... except when
I'm travelling, at which time it is a blessing.

Apologies, and cheers

david

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