Tom, You have it right.
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3/4 [_1/2_] 3-10
30
(6)
***Completely edited*** I corrected some of the info that was wrong.
Excuse my drawing, but the dim to the left is the slot width(3/4), dim inside the slot weld symbol is the depth of filling if no dim is show it is to be filled completely,dim directly under is the angle of the counter sink(30degrees), the dim directly under the angle of countersink is the number of slots shown in parenthasis(6), the dim on the right is the length of weld(3") followed by the pitch(10"c/c) AWS A2.4-98 pages 61-64