Z-fold, black grid
Paper impregnated or coated with materials sufficiently sensitive to make a permanent record of very faint tracings produced by an electrocardiograph. It is usually rolled.
NSN 5945-01-332-2482
NSN 6130-01-623-5954
NSN 6130-01-224-7393
NSN 2925-00-156-0999
NSN 6145-01-101-4900
NSN 6220-01-546-6371
NSN 6240-01-236-0781
NSN 5945-00-678-0018
NSN 5925-01-457-2091
NSN 5998-01-399-0615
NSN 5960-00-161-9345
NSN 6610-01-237-4416