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In 1975 or thereabouts, Airstream went to a one piece mattress
for the convertible sofa such that the mattress bends at the intersection of the
seat and back when in the sofa position. When opened out, there is a
single double (full) size foam mattress, with no lengthwise
crevasse.
This system, in my opinion works very well. Therefore I
would recommend any restoration on an older unit with the muti-section design be
updated to the newer design.
Oliver Filippi
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