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g) Aerial Survey In this type of survey data about large tracks of land is collected by taking photographs from an aero-plane. h) Reconnaissance Survey In this type of survey, data is collected by marking physical observation and some measurements using simple survey instruments. 2) Surveying based on Type of Instruments a) Chain Surveying

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Green industry has always been one of the development strategies of Henan mining machinery Co., Ltd. the company strives to make full use of advanced technology and excellent talents to catch up with the international pace of the world. Our company can provide strong support for our customers and partners, which will not let you disappointed in our products and sales services at the same time.

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