Nr. 70
Pipe helicoid with curve lines
Row: 1

Nr. 68
Developable helicoid
Row: 1

Nr. 384
Rotational surfaces, asymptote lines
Row: 2

Nr. 385
Rotational surfaces, asymptote lines
Row: 2

Nr. 201
Rotational surfaces, asymptote lines
Row: 2

Nr. 202
Rotational surfaces, asymptote lines
Row: 2

Nr. 210
Rotational surfaces, asymptote lines
Row: 3

Nr. 209
Rotational surfaces, asymptote lines
Row: 3

Nr. 208
Rotational surfaces, asymptote lines
Row: 3

Nr. 207
Rotational surfeaces, asymptote lines
Row: 3

Nr. 65
Standard helicoid
Row: 4

Nr. 378
Helical surface
Row: 4

Nr. 67
Standard helicoid
Row: 4