MAINTENANCE is the activity involved in maintaining something in good working order. May include replacement of significant portions of the item(s) being maintained.
PERPETUAL is a fixed income security with no maturity date, such as a preferred stock with no sinking fund.
DDA, among others, can mean: Disability Discrimination Act (1995, UK), Dividend Disbursing Agent (finance), Demand Deposit Account, Direct Deposit Advance (Wells Fargo), Direct Deposit Advice, Deposit Demand Account, or Design Development Activity.
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