Since modal verbs in other Germanic languages are not defective, the problem of double modals (see above) does not arise: the second modal verb in such a construction simply takes the infinitive form, as would any non-modal verb in the same position.
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TAT: Technical Acceptance Test: TAT: Thermal Analysis Tool (Intel) TAT: Threat Assessment Team (various schools) TAT: Type Approval Test (various companies) TAT: Transcontinental Air Transport (airline) TAT: Trading Arrangement Table: TAT: Torpedo Attack Teacher (US Navy) TAT: Total Action Time