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Base class for LTO labels.
Specification taken from "IBM LTO Ultrium Cartridge Label Specification, Revision 3"
available on May 14th 2008 from :
http://www-1.ibm.com/support/docview.wss?rs=543&context=STCVQ6R&q1=ssg1*&uid=ssg1S7000429&loc=en_US&cs=utf-8&lang=en+en
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Initializes an LTO label.
prefix : Up to six characters from [A-Z][0-9]. Defaults to "".
number : Label's number or None. Defaults to None.
subtype : LTO subtype string , e.g. "1" for LTO1. Defaults to "1".
border : None, or the width of the label's border. Defaults to None.
checksum : Boolean indicates if checksum char has to be printed. Defaults to False.
availheight : Available height on the label, or None for automatic. Defaults to None.
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A class for LTO labels with rectangular blocks around the tape identifier.
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