The ornamental design for a magneticholder for threadbobbin and bobbin shaped metal object, as shown.
FIG. 1 is a perspective view showing a magnetic holder for thread bobbin
and bobbin shaped metal object, according to my new design;
FIG. 2 is a reduced front elevational view thereof, the rear being
identical, the broken line showing of a bobbin is for illustrative
purposes only, and forms no part of the claimed design;
FIG. 3 is a further reduced top plan view thereof;
FIG. 4 is a left or right side elevation view thereof; and,