Equipment<hr style='border:1px solid black; margin: 2px 0;'/>- equipmentID - type - brand - model - status<hr style='border:1px solid black; margin: 2px 0;'/>+ add() + updateStatus()

Warranty<hr style='border:1px solid black; margin: 2px 0;'/>- warrantyID - equipmentID - startDate - endDate - isActive<hr style='border:1px solid black; margin: 2px 0;'/>+ checkStatus() + sendAlert()

RepairTicket<hr style='border:1px solid black; margin: 2px 0;'/>- ticketID - equipmentID - issueDesc - urgency - status<hr style='border:1px solid black; margin: 2px 0;'/>+ create() + assignTech()

Supplier<hr style='border:1px solid black; margin: 2px 0;'/>- supplierID - companyName - contactPerson - phone - email<hr style='border:1px solid black; margin: 2px 0;'/>+ addSupplier() + update()

RepairLog<hr style='border:1px solid black; margin: 2px 0;'/>- logID - ticketID - repairDate - actions - cost<hr style='border:1px solid black; margin: 2px 0;'/>+ addEntry() + getHistory()

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