However, the original sources of seed and dates for introductions to many countries are poorly documented.
Twitter is working on the introduction of two-factor authentication, but has not announced any date for its introduction.
However, the company's new Longhorn operating system, which has focused on search technology, has been delayed and there is no public date for its introduction.
Mr. Hao declined to provide a date for the introduction of a national incentive policy for energy-efficient construction materials and did not specify what materials would qualify.
(It has not set a date for the introduction or said whether the three-cylinder version will be sold in the United States).
But Mr Lee recalls that ten years ago nobody was arguing that 2007 the earliest date for the introduction of full democracy allowed under the Basic Law was too early.
The mayor, Boris Johnson, indicated the start date for the introduction of the night tube could be postponed – a concession that may allow time for negotiations to avert further strikes.
That executive said that a deal may come after June 9, when Apple's chief executive, Steven P. Jobs, speaks to the company's developers conference, a logical date for the introduction of the next generation of iPhone.
Because of failure to agree on franchise qualifications, the number of elected seats in the legislature, and the timing of the elections, a constitutional conference held in London in 1962 was unable to fix a date for the introduction of internal self-government or for independence.
