https://nginx-develop-nfsa2.govcms7.amazee.io/sites/default/files/2024-04/Singoring%201000x745.jpg
B-wind
A way of denoting perforation position in single perforation raw stock such as 16mm and 8mm.
https://nginx-develop-nfsa2.govcms7.amazee.io/sites/default/files/uploads/2010/09/13/awind.jpg
References
Kodak 1999
The National Film and Sound Archive of Australia acknowledges Australia’s Aboriginal and Torres Strait Islander peoples as the Traditional Custodians of the land on which we work and live and gives respect to their Elders both past and present.