[GreenKeys] Wood tables

[w9ddd at tapr.org]

Every once in a while I see a reference to a wood table.   Like for instance a listing for a 28 ASR on c-list.  I sort chalked that up to being a Frankenstein.  But I see some references to a wood 15 table and now a 19 on this list.  What would be the motivation for a wood table.  Shortage of iron during a war or?  

I can't find documentation in the usual places.  There's the case of TG-7 (?), where the shipping crate becomes the table.  But that's all I find.

John, W9DDD