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How wide is that tongue and groove piece under there. If its under 2" then it is normally a hardwood floor which is pretty common from houses built in the 20-40s. Not sure about 1911. When I restored the Greene and Greene from 1908, we made sure the floor was salvaged and made new to match damaged areas. If that piece is more then 5" wide then it should be your sub floor. Kitchen were usually different and didn't have finish hardwood floors. If you are doing a complete remod. of the kithcen, pop out the stone floor first then the cement board will come out in chunks if you can slip a large pry bar under there. LIke Greg said, set depth of skill saw and but out the plywood to salvage the hardwood floor. Be realy careful to not score the hardwood flood with the skill saw. I always have my guys get one chink out and carefully pry out the rest instead of going in gung-ho skill saw blazing. Some of the stuff we do just can't be replaced.
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