The ornamental design for a monitor and keyboardsupportarm, as shown and described.
FIG. 1 is an upper right front perspective view of a monitor and keyboard support arm showing our new design with additional environment;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is an upper right front perspective view of the monitor and keyboard support arm, with additional environment removed for clarity;
FIG. 8 is a front elevation view thereof;
FIG. 9 is a left side elevation view thereof;
FIG. 10 is a rear elevation thereof;
FIG. 11 is a bottom plan view thereof; and,
FIG. 12 is a top plan view thereof.
The broken lines immediately adjacent to the claim in FIGS. 5 and 11 depict the bounds of the claimed design, while all other broken lines are directed to environment. The broken lines form no part of the claimed design.