We claim the ornamental design for an adjustable chemical vapor deposition showerhead assembly, as shown and described.
FIG. 1 is a front view of an adjustable chemical vapor deposition showerhead assembly, showing our new design
FIG. 2 is a back view thereof.
FIG. 3 is a right side view thereof.
FIG. 4 is a left side view thereof.
FIG. 5 is a top view thereof.
FIG. 6 is a bottom view thereof, wherein holes are represented in dashed lines to indicate that they are for illustrative purposes only and that the hole pattern does not form a part of the claimed design.
FIG. 7 is an isometric top, front view thereof; and,
FIG. 8 is an expanded isometric view of the top-most portion of the adjustable chemical vapor deposition showerhead assembly shown in FIG. 7.