Combo Box List: Repeated Names Problem

my search form has a combo box with "make"names. i can add new makes via a other form. so the combo box needs te run via a query so that it can list new makes (so that i can also search them). but, since some makes repeat them selves in the table, sometimes up to 15 times (see atachment 1), the combo box will show 15 times the same make. i just need it to show the make 1 time, all of the makes just 1 time. only way i can do that is to type them my self (see atachment 2). but then new makes that are added later wont be shown in the list.

so: i want that the make is only shown once in the list, and that the list is updated with new makes that are added later. how do i do that?

note: a "make" E.G = Philips, Apple, LG, Microsoft, creative etc (just for the lesser skilled english readers like me )

all help is welcome