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I'm afraid I'm not sure I understand what you're asking. Would you mind elaborating? Would you like to know the earliest date for which price history for a stock is available? Or are you asking for something else?
request identifier com api
Can I retrieve the P/E and Auditor datapoint of a Fund (Unit Trust) in Excel using the API?
How to show results of a RHistory query with VBA into an Excel sheet?
Get a value on a specific date
Replicating RHistory in .NET without Eikon