I've noticed on Loom Clamps in boxes that there is a letter "N" and a letter "T" stamped on the toungue of the clamp.

Anyone know what "N" and "T" mean?

Steel City and Raco brands have them...

I've seen the N-T on what I believed to be really old boxes too.

Wow! I've actually stumped you guys!

My friend, (former co-worker, fellow electrical contractor) Joe M. asked me this a few years ago... Not even an iota of a clue anyone?