Stopfakes.gov is a US Government site that offers one of the most comprehensive online toolkits to help businesses understand and protect their intellectual property rights. The site provides resources to answer:
The full IP protection toolkit can be found here.*
Tt (telegraphic transfer), * bill etc. vs. lc (letter of credit)
Author: Catalyst
Back to back letters of credit
Author: Catalyst
The original LC and the one issued against it are independent. See how it works.