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concession period
特许权时期（阶段）

Government re - acquires ownership of properties turned over to investor after concession period and may opt to share in the financial benefits of the investment 7
-政府在特许权时期结束后重新取得被移交给投资者的地产所有权，也可选择分享投资所带来的收益
The company hold the ownership , management and proceeds of the project during the concession period and transfer the project to the government without charge after concession period
公司在特许期限内拥有该项目的所有权、经营权、收益权，待特许期结束后，再将项目无偿地转让给政府机构。
Among them the project of chengdu no . 6 water plant b formally signed the < concession agreement > and its appendixes in august 1999 . it began to operate on feb . ll , 2002 . with the concession period of 15 years
其中，成都自来水六厂b厂项目于1997年7月草签项目特许权协议及其附件， 2002年2月11日正式运营，特许经营期15年。
If the concession period of the airport is increased to 30 years rather than the 25 years initially suggested the banco efisa study says that the 472 million euros the portuguese government had earmarked for the airport can be reduced or even cancelled out altogether
银行称，如果机场的特许经营期限从原来的25年延长至30年，葡萄牙政府4 . 72亿欧元专项机场资金将降低，甚至完全抵消。
Article 17 within the concession period , the project company shall , in accordance with the provisions of the concession contract , uninterruptedly provide public products and services , maintain the urban infrastructure subject to concessionary management and ensure it in good operation
第十七条特许期限内，项目公司应当按照特许协议的约定不间断地提供公共产品和服务，对实施特许经营的城市基础设施进行维修，保证设施的良好运转。

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Note added at 1 hr (2017-01-22 07:51:57 GMT)
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project concession period = 项目特许期


高速公路BOT项目特许期决策模型A Decision-making Model of the ...
202.193.70.152:8081/ZK/detail.aspx?id=49299713
特许期是政府和项目公司在高速公路BOT项目的前期决策阶段的重要决策参数。 ... A Decision-making Model of the Concession Period for BOT Highway Projects ...
Concession Period Decision Models for Public Infrastructure Projects ...
https://www.hindawi.com/journals/mpe/2015/671764/ - 翻译此页
作者：Z Wang - ‎2015 - ‎相关文章
2015年8月27日 - Abstract. Concession period is an important decision-making variable for the investment and construction of public infrastructure projects.
高速公路BOT项目特许期决策模型- 期刊 - 中国知网
r.cnki.net/kcms/detail/detail.aspx?filename=GCXT201402012&dbcode...v...
【摘要】 特许期是政府和项目公司在高速公路BOT项目的前期决策阶段的重要决策参数。 ... the early decision-making stage of BOT highway project,concession period is ... A decision-making model of the concession period using System Dynamics ...

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Note added at 1 day2 hrs (2017-01-23 08:46:12 GMT)
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以下两个英文网页证明了BOT project 中Concession是特许权，不是“优惠”。

https://en.wikipedia.org/wiki/Build–operate–transfer
Concession (contract) - Wikipedia
https://en.wikipedia.org/wiki/Concession_(contract)
翻译此页
A concession or concession as an agreement is a grant of rights, land or property by a ... concessions in department stores operated by other retailers. Short term concessions may be granted as promotional space for periods as short as one ...