The phrase "approval of which" is correct and can be used in written English.
It is used to refer to something that has been previously mentioned in the sentence. For example: We recently submitted an application for funding, approval of which is still pending.
Mr. Beebe, a Democrat, lobbied extensively for the bill, approval of which required an extraordinary three-fourths majority vote in both chambers of the General Assembly.
The signing will mean that the controversial project, the approval of which was delayed by Theresa May after she became prime minister in July, is all but certain to go ahead.
As a practical matter, it is not clear how the concerns that the senators are now expressing will affect the vote on the treaty, the approval of which is a priority for President Obama.
Applying the "social experiment" label is typically an attempt to divert blame or avoid criticism by claiming the negative reaction was actually intended all along, as part of some amateur scientific investigation, the hypothesis, variables, results and ethical approval of which are rarely if ever disclosed.
This may be taken as the more certain since the author has dedicated this work to his friend Joseph Haydn, Kapellmeister to Prince Esterhazy, who has honored it with all the approval of which a man of great genius is alone worthy".
Parliamentwatch, a German pressure group, reported recently that hundreds of lobbyists have passes to enter the Bundestag, approval of which requires the support of a parliamentary party.In this section Keeping it on the company campus After OPEC At the sharp end Turning American Friends with benefits?
The settlement, which includes the increase for first-class stamps, is subject to the approval of the independent Postal Rate Commission, which is expected to vote in the spring.
United International Pictures, which has distribution rights for both movies, said yesterday it will apply to Malaysia's film censorship board for approval of Munich, which depicts the aftermath of the massacre of Israeli athletes at the 1972 Olympics.
The proposal is subject to the approval of City Council, which is scheduled to consider it this spring.
Fiscal policy would require the approval of Congress, which Cassidy and James Surowiecki say is unlikely.
The financing plan needs the approval of Parliament, which is controlled by Ms. Yingluck's party.
