[Dan_San_Abbott]

Lloyd:
Rib tapes were about 25 mm wide, purpose of the rib tapes is to protect and cover the stitching of the fabric to the fabric strip that is glued/doped to the rib faces.
The tapes you are illustrating are about 10mm wide and they would not cover a up the rib stitching. I have a hunch that Fokker has may have use a 10mm linen tape on top of the fabric and stitched over/through it and the fabric to the rib fabric strip and secured the fabric in that manner. It is not rib tape in the common term. This method was employed when tacking the fabric to the ribs. Tacks were most likely use on the leading edge portion that has the plywood covering, in this area you cannot sew the fabric to the rib.
blue skies,
Dan-San