All the utensils that are found in Jerusalem on the path leading down to the mikveh are [assumed to be] tamei; but [those found] on the path leading up [from the mikveh] are [assumed to be] tahor, for the path of their descent is not [the path] of their ascent; [these are] the words of R’ Meir.  R’ Yose says: All are [assumed to be] tahor except for the basket, the shov-el, and the spade that are reserved for gravesites.