I just developed my first roll of 120 last night. Kodak 400TX. The camera works 
Anyway, on the bottom edge of the film are the frame numbers 1-12 and little arrows. On the top is Kodak, 400tx, and another set of numbers, 41-53 (if I recall correctly). They have roughly the spacing of the frame numbers. What are they for? Do they mean anything?

Anyway, on the bottom edge of the film are the frame numbers 1-12 and little arrows. On the top is Kodak, 400tx, and another set of numbers, 41-53 (if I recall correctly). They have roughly the spacing of the frame numbers. What are they for? Do they mean anything?