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["机要文件交寄单"]
["寄件单位（公章）： "]
["发出日期：    年   月   日          第     号     第      页"]
["序号","收件单位名称","号码","件数",null,null,"发件单位","机要通信编号","备注"]
[{"$nulls":3},"绝","机","密"]
[1]
[2]
[3]
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[5]
[6]
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["本页合计      件，  本号单共计      页        件"]
["登记人：           接收人（章）：             接收日戳"]
["送件人："]

{"sheet":"Sheet2","index":1,"n_rows":0,"n_cols":0,"rows_kept":0,"flags":["formulas_cached_only"]}

{"sheet":"Sheet3","index":2,"n_rows":0,"n_cols":0,"rows_kept":0,"flags":["formulas_cached_only"]}