Anyone closely involved in patents and inventions soon learns that most new ideas are, in fact, as old as the hills. It is their reduction to commercial practice, either through necessity or dedication, or through the availability of new technology, that makes news and money. The basic patent for the theory of magnetic recording dates back to 1886. Many of the original ideas behind television originate from the late 19th and early 20th century. Even the Volkswagen rear engine car was anticipated by a 1904 patent for a cart with the horse at the rear.
41. The passage is mainly about ________.
[A] an approach to patents
[B] the application for patents
[C] the use of patents
[D] the access to patents
42. Which of the following is TRUE according to the passage?
[A] When a patent becomes out of effect, it can be re-patented or extended if necessary.
[B] It is necessary for an inventor to apply for a patent before he makes his invention public.
[C] A patent holder must publicize the details of his invention when its legal period is over.
[D] One can get all the details of a patented invention from a library attached to the patent office.
43. George Valensis patent lasted until 1971 because ________.
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