Please note that written proof of delivery is not provided for registered mail.

挂号邮件不提供书面签收回条服务。

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You have written proof of the efficacy of not just your program, but also your implementation of it, for the regulators.

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Check with the individual delivery service to find out how to get written proof of the mailing date and keep it handy with copies of your return.

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The company said garages would need to be provided with written proof from a local official dealer that the car could not be converted to run on alternative fuels.

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