The ornamental design for a pipe mounted attachmentbracket, as shown and described.
FIG. 1: is a perspective view of a pipe mounted attachment bracket;
FIG. 2: is a front view of the pipe mounted attachment bracket of FIG. 1;
FIG. 3: is a top front view of the pipe mounted attachment bracket of FIG. 1;
FIG. 4: is a side view of the pipe mounted attachment bracket of FIG. 1; and,
FIG. 5 is a bottom view of the pipe mounted attachment bracket of FIG. 1.
The broken line showing of a pipe mounted attachment bracket is for the purpose of illustrating portions of the article and forms no part of the claimed design.