Selection of nine single surface M�bius strip models

Selection of nine single surface Möbius strip models, (a) cylinder, (b) Mobius Band, one edge, one loop, one twist, (c) one sided surface, one edge, two loops, one twist, (d) Multiple Mobius Band, one edge, three loops, three twists, (e) Multiple Mobius band (Bill's surface) one edge, three loops, three twists (f) One-sided surface, two edges, two loops, one twist, (g) One-sided surface, two edges, two loops, two twists, (h) One-sided surface, two edges, three loops, two twists, (i) One-sided surface, three edges, three loops, one twist, 1967.