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The short answer is that sometimes you can tell from the ISINs that two bonds have the same issuer; but the converse does not work. Some bonds have a CUSIP assigned (for a small fee when the bond is issued) by the CUSIP authority (which happens to be Standard & Poors). A CUSIP has 9 characters: 6 characters for the issuer; 2 characters for the issue; and ...

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