Comb bind means to plastic comb bind by inserting the comb into punched holes.

Comb Stationary unit of shearing hand-piece which enters and holds the wool as it is cut. Also a machine which aligns fibres during manufacture.

See also:
"Comb" is in the HS Code "8527"
Reception Apparatus For Radio-Telephony, Radio-Telegraphy Or Radio-Broadcasting, Whether Or Not Comb