Let me tell ya, I been a licensed master in the city of buffalo for over 25 years and doing this shit 10 years before that, the houses don't get much older than that, Hell we still have lead services and lead bends. Tile repairs and tile traps are still done but usually not as a first choice, there are usually other factors involved such as cost or limited space.
Today some State Codes don't even allow the use of clay tile anymore, even though many of our older cities are built on it.
Just so you know we have one guy here on the board that use to install the old oak mains with his dad, right JP ;)
kenny b