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Eduncle Best Answer
Under Article 155 of the Constitution, the Comptroller and Audit General of India shall be appointed by the President by warrant under his hand and seal. This means that the appointment letter bears the signature and seal of the President Of India. The rest of the appointments doesn't require the signature of the President as he can delegate this to other authority. In that case the appointment letter will bear the signature of the respective authority. Even Judges of Supreme Court and Governor of a state is appointed by President by warrant under his hand and seal.