Symbol 5131 from IEC 60417 - Title/Meaning: Long pulse Function/description: To identify the long-pulse position of the pulse length selection switch.
Additional information: 
See also symbol 5130
Published in: Supplement A, 1974
Own work using: iso.org/obp/graphics/grs/c146570b-9674-4ce2-b039-ab92697b7e84 200.png
Vectorization:  Mrmw