Playing field boundary marker

The ornamental design for a playing field boundary marker, substantially as shown and described.

FIG. 1 is a front view of a playing field boundary marker showing our new design;

FIG. 2 is a typical side view;

FIG. 3 is a typical end view; and

FIG. 4 is a rear view thereof.

Patent	Priority	Assignee	Title
D569747,	Jul 12 2007		Accessibility ruler
D659147,	Aug 08 2011	Hon Hai Precision Industry Co., Ltd.	Support mechanism
D669482,	Aug 08 2011	Hon Hai Precision Industry Co., Ltd.	Support mechanism
D854951,	Oct 06 2017		Folding rule
D916177,	Nov 21 2016		Label for keyboard

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