Document:

Exhibit 4.7

 

Amended
and Restated Power of Attorney

 

I, Li Donglin, with the ID
number of 132903196312249814 , am a shareholder who owns a 6.98% equity interest in Beijing Baihengda Petroleum
Technology Co., Ltd. (" Petroleum Technology ") (" My Equity "). Regarding
my equity, I hereby irrevocably authorize Recon Hengda Technology (Beijing) Co., Ltd. (" Hengda Technology ")
to exercise the following rights during the validity period of this power of attorney:

 

To authorize Hengda Technology
to act as my sole and exclusive agent to exercise all rights on my behalf in my name on matters related to my equity, including but not
limited to the following rights: (1) participate in the shareholders’ meeting of Petroleum Technology and execute the relevant shareholders’
resolutions on my behalf; (2) exercise all the shareholder rights that I have in accordance with the law and the articles of association
of Petroleum Technology, including but not limited to shareholders’ voting rights, the right to sell or transfer or pledge or dispose
of all or any part of my equity; and (3) as my authorized representative, designate and appoint the legal representative, chairman of
the board, directors, supervisors, general manager and other senior management personnel of Petroleum Technology.

 

Hengda Technology will have
the right to sign the revised and restated exclusive right of purchase contract (I shall be a party to the contract) on behalf of me within
the scope of authorization, and perform the assignment contract as a party to the contract on the same day as this power of attorney.
The exercise of the revised and restated equity pledge contract and the revised and restated exclusive right of purchase contract signed
will not impose any restriction on the exercise of this authorization.

 

Except as otherwise stipulated
in this power of attorney, all actions of Hengda Technology regarding my equity can be made in accordance with its own judgment without
any oral or written instructions from me.

 

All acts of Hengda
Technology regarding my equity shall be regarded as my own, and all signed documents shall be deemed to have been signed by me, and I
will recognize it.

 

Hengda Technology has the right
to delegate, and can re-delegate other individuals or units on its own for the handling of the above matters and the exercise of its own
equity without notifying me or obtaining my consent in advance, but it shall notify me immediately afterwards, and such delegated rights
The exercise shall not harm my interests.

 

While I am a shareholder of
Petroleum Technology, this power of attorney is irrevocable and continues to be valid, starting from the date of signing this power of
attorney.

 

During the period of this power
of attorney, if I need to exercise all the rights related to my equity that have been authorized to Hengda Technology through this power
of attorney, I shall negotiate with Hengda Technology.

 

 

	 	Signed by: Li
    Donglin
	 	 
	 	/s/ Li Donglin
	 	Li Donglin
	 	 
	 	 
	 	Effective as of April 1, 2019Exhibit 4.8

 

Amended and
Restated Power of Attorney

 

I,
Chen Guangqiang, with the ID number of 132903196307299817 , am a shareholder who owns a 90.37% equity
interest in Beijing Baihengda Petroleum Technology Co., Ltd. (" Petroleum Technology ") (" My
Equity "). Since my equity interest in the Power of Attorney dated January 1, 2008 has been effectively canceled, I
hereby irrevocably authorize Recon Hengda Technology (Beijing) Co., Ltd. ( " Hengda Technology ") to exercise
the following rights during the validity period of this power of attorney:

 

To
authorize Hengda Technology to act as my sole and exclusive agent to exercise all rights on my behalf in my name on matters related to
my equity, including but not limited to the following rights: (1) participate in the shareholders’ meeting of Petroleum Technology
and execute the relevant shareholders’ resolutions on my behalf; (2) exercise all the shareholder rights that I have in accordance
with the law and the articles of association of Petroleum Technology, including but not limited to shareholders’ voting rights,
the right to sell or transfer or pledge or dispose of all or any part of my equity; and (3) as my authorized representative, designate
and appoint the legal representative, chairman of the board, directors, supervisors, general manager and other senior management personnel
of Petroleum Technology.

 

Hengda Technology will have
the right to sign the revised and restated exclusive right of purchase contract (I shall be a party to the contract) on behalf of me within
the scope of authorization, and perform the assignment contract as a party to the contract on the same day as this power of attorney.
The exercise of the revised and restated equity pledge contract and the revised and restated exclusive right of purchase contract signed
will not impose any restriction on the exercise of this authorization.

 

Except as otherwise stipulated
in this power of attorney, all actions of Hengda Technology regarding my equity can be made in accordance with its own judgment without
any oral or written instructions from me.

 

All acts of Hengda
Technology regarding my equity shall be regarded as my own, and all signed documents shall be deemed to have been signed by me, and I
will recognize it.

 

Hengda Technology has the right
to delegate, and can re-delegate other individuals or units on its own for the handling of the above matters and the exercise of its own
equity without notifying me or obtaining my consent in advance, but it shall notify me immediately afterwards, and such delegated rights
The exercise shall not harm my interests.

 

While I am a shareholder of
Petroleum Technology, this power of attorney is irrevocable and continues to be valid, starting from the date of signing this power of
attorney.

 

During the period of this power
of attorney, if I need to exercise all the rights related to my equity that have been authorized to Hengda Technology through this power
of attorney, I shall negotiate with Hengda Technology.

 

 

	 	/s/ Chen Guangqiang
	 	Chen Guangqiang
	 	 
	 	 
	 	Effective as of April 1, 2019Exhibit 4.9

 

Amended and
Restated Power of Attorney

 

I, Zhang Fan, with ID number 110102195701253016 ,
am a shareholder who owns a 0.84% equity interest in Beijing Baihengda Petroleum Technology Co., Ltd.
(" Petroleum Technology ") (" My Equity "). Regarding my equity, I hereby
irrevocably authorize Recon Hengda Technology (Beijing) Co., Ltd. (" Hengda Technology ") to exercise the following
rights during the validity period of this power of attorney:

 

To authorize Hengda Technology
to act as my sole and exclusive agent to exercise all rights on my behalf in my name on matters related to my equity, including but not
limited to the following rights: (1) participate in the shareholders’ meeting of Petroleum Technology and execute the relevant shareholders’
resolutions on my behalf; (2) exercise all the shareholder rights that I have in accordance with the law and the articles of association
of Petroleum Technology, including but not limited to shareholders’ voting rights, the right to sell or transfer or pledge or dispose
of all or any part of my equity; and (3) as my authorized representative, designate and appoint the legal representative, chairman of
the board, directors, supervisors, general manager and other senior management personnel of Petroleum Technology.

 

Hengda Technology will have
the right to sign the revised and restated exclusive right of purchase contract (I shall be a party to the contract) on my behalf and
within the scope of authorization, and perform the assignment contract as a party to the contract on the same day as this power of attorney.
The exercise of the revised and restated equity pledge contract and the revised and restated exclusive right of purchase contract signed
will not impose any restriction on the exercise of this authorization.

 

Except as otherwise stipulated
in this power of attorney, all actions of Hengda Technology regarding my equity can be made in accordance with its own judgment without
any oral or written instructions from me.

 

All acts of Hengda
Technology regarding my equity shall be regarded as my own, and all signed documents shall be deemed to have been signed by me, and I
will recognize it.

 

Hengda Technology has the right
to delegate, and can re-delegate other individuals or units on its own for the handling of the above matters and the exercise of its own
equity without notifying me or obtaining my consent in advance, but it shall notify me immediately afterwards, and such delegated rights
The exercise shall not harm my interests.

 

While I am a shareholder of
Petroleum Technology, this power of attorney is irrevocable and continues to be valid, starting from the date of signing this power of
attorney.

 

During the period of this power
of attorney, if I need to exercise all the rights related to my equity that have been authorized to Hengda Technology through this power
of attorney, I shall negotiate with Hengda Technology.

 

 

	 	/s/ Zhang Fan
	 	Zhang Fan
	 	 
	 	 
	 	Effective as of April 1, 2019Exhibit 4.10

 

 Amended
and Restated Power of Attorney 

 

I,
Feng Zhiqiang, with the ID number of 132323196210021053 , am a shareholder who owns a 0.56% equity
interest in Beijing Baihengda Petroleum Technology Co., Ltd. (" Petroleum Technology ") (" My
Equity "). Regarding my equity, I hereby irrevocably authorize Recon Hengda Technology (Beijing) Co., Ltd. (" Hengda
Technology ") to exercise the following rights during the validity period of this power of attorney:

 

To
authorize Hengda Technology to act as my sole and exclusive agent to exercise all rights on my behalf in my name on matters related to
my equity, including but not limited to the following rights: (1) participate in the shareholders’ meeting of Petroleum Technology
and execute the relevant shareholders’ resolutions on my behalf; (2) exercise all the shareholder rights that I have in accordance
with the law and the articles of association of Petroleum Technology, including but not limited to shareholders’ voting rights,
the right to sell or transfer or pledge or dispose of all or any part of my equity; and (3) as my authorized representative, designate
and appoint the legal representative, chairman of the board, directors, supervisors, general manager and other senior management personnel
of Petroleum Technology.

 

Hengda Technology will have
the right to sign the revised and restated exclusive right of purchase contract (I shall be a party to the contract) on behalf of me within
the scope of authorization, and perform the assignment contract as a party to the contract on the same day as this power of attorney.
The exercise of the revised and restated equity pledge contract and the revised and restated exclusive right of purchase contract signed
will not impose any restriction on the exercise of this authorization.

 

Except as otherwise stipulated
in this power of attorney, all actions of Hengda Technology regarding my equity can be made in accordance with its own judgment without
any oral or written instructions from me.

 

All acts of Hengda
Technology regarding my equity shall be regarded as my own, and all signed documents shall be deemed to have been signed by me, and I
will recognize it.

 

Hengda Technology has the right
to delegate, and can re-delegate other individuals or units on its own for the handling of the above matters and the exercise of its own
equity without notifying me or obtaining my consent in advance, but it shall notify me immediately afterwards, and such delegated rights
The exercise shall not harm my interests.

 

While I am a shareholder of
Petroleum Technology, this power of attorney is irrevocable and continues to be valid, starting from the date of signing this power of
attorney.

 

During the period of this power
of attorney, if I need to exercise all the rights related to my equity that have been authorized to Hengda Technology through this power
of attorney, I shall negotiate with Hengda Technology.

 

 

	 	/s/ Feng Zhiqiang
	 	Feng Zhiqiang
	 	 
	 	 
	 	Effective as of April 1, 2019

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