The term "before and after patents" as stipulated in Article 51 of the Patent Law should mean that the patented technology itself is dependent, and the latter is an improvement based on the former, and this improvement must be "a significant technological progress with significant economic significance".
What you mentioned is more advanced and more obvious, but it doesn't mean that the implementation of the patent of the research institute must rely on the patent of the machinery factory. For example, if the former one is about bicycle tires and the latter one is about bicycle cushions, this situation does not belong to the situation that the implementation of the latter patent depends on the implementation of the previous invention or utility model as stipulated in Article 51 of the Patent Law.
Article 48 Under any of the following circumstances, the patent administration department in the State Council may grant a compulsory license to exploit a patent for invention or utility model upon the application of a unit or individual that has the conditions for exploitation:
(1) The patentee has not exploited or fully exploited his patent for three years from the date when the patent right was granted, and for four years from the date when the patent application was filed;
(2) the patentee's act of exercising the patent right is recognized as a monopolistic act according to law, in order to eliminate or reduce the adverse impact of the act on competition.
article 51 where an invention or utility model for which a patent right has been granted is a significant technological progress with significant economic significance compared with the invention or utility model for which a patent right has been granted before, and its implementation depends on the implementation of the previous invention or utility model, the patent administration department of the State Council may, upon the application of the latter patentee, grant a compulsory license to exploit the previous invention or utility model.
in the case of granting a compulsory license for exploitation in accordance with the provisions of the preceding paragraph, the administrative department for patent in the State Council may also grant a compulsory license for exploitation of the latter invention or utility model upon the application of the former patentee.
article 53 in addition to the compulsory license granted in accordance with the provisions of article 48 (2) and article 5 of this law, the implementation of compulsory license shall be mainly for the supply of domestic market.
article 54 a unit or individual applying for compulsory license in accordance with the provisions of item (1) of article 48 and article 51 of this law shall provide evidence to prove that it requested the patentee to license it to exploit the patent under reasonable conditions, but failed to obtain the license within a reasonable time.
Regulation:
Article 73 The term "not fully exploiting the patent" as mentioned in Item (1) of Article 48 of the Patent Law means that the patentee and its licensee cannot exploit the patent in a way or scale that meets the domestic demand for patented products or patented methods.