The ornamental design for a headstrap for a nebulizer mask, as shown and described.
FIG. 1 is a front isometric view of a head strap for a nebulizer mask shown in use;
FIG. 2 is a rear isometric view thereof, broken away for ease of illustration;
FIG. 3 is a reduced front elevational view of a head strap for a nebulizer mask;
FIG. 4 is an enlarged front elevational view of FIG. 3 shown broken away for ease of illustration;
FIG. 5 is a rear elevational view thereof, with an enlarged detail shown in the broken line circle;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a left side elevational view thereof;
FIG. 8 is a top plan view thereof;
FIG. 9 is a bottom plan view thereof;
FIG. 10 is a front isometric view, shown in an alternate position and in use;
FIG. 11 is a front isometric view, shown in an alternate position and in use in an alternate environment; and,
FIG. 12 is a front isometric view thereof, shown in an alternate environment.
The broken line showing of a child with mask and the broken line showing of a fastener is included for the purpose of illustrating environment and forms no part of the claimed design.
The broken line showing on the surface of the article is stitching and is part of the claimed design.