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    <subfield code="a">On Estimating Lot Size for A Variable Lifetime Stock Items / </subfield>
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    <subfield code="a">We want to estimate the number of micrometers to be kept in stock to fulfill inspection needs for a period of five years, assuming: We always need 12 micrometers in simultaneous operation.
The lifetime of the micrometers is not fixed, and the probable lives of the items are based on past experience
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