IBM 3270 Quick Reference page 9

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The following information should be recorded and retained.
IBM Product Name
IBM Model Number
IBM Serial Number
IBM Key Number
• The product name is on the front of the product.
• The model number of this product is located on the outside of the
product and will have a preface of:
"Type" or
"Model."
• The serial number of this product is located on the outside of the
product, and will have a prefix of S/N.
• The serial number for the keys is located on the tag attached to the
keys. Additional keys may be ordered from the address listed on
the key tag.