If the patent expires expIres within a -In the -In the -1 n the -after year: at the price at which It 2nd year: at 2ss less than the price at which It was bought; 3rd year: at 40S less than the price at which It was bought; 4th year: at 70S less than the price at which It was bought; the 4th year at no cost at at 1(23.24). 18. This Is true of contracts referring to the manufacture of: wood for construction. parts for concrete mixers, premoulded Items, electrical materials for construction, refractarles and plastics for building. 19. Contract referring to wood for construction. 20. Contract for manufacture of premoulded Items, drawn up In 1970. 21. Contract for the manufacture of elements for perforated pipes. 22. As an example another text states for the same clause that: once the contract Is sold{the licensor) can buy the machinery from (the local firm) at the Invoice price less depreciation. at a reduction of 15S of the value In the first year and lOS In successive years, or at the depreciated value of the machines. plant and equipment which figures In the manufacturer's accounting. whichever Is the lower". <Contract for manufacturing metal floors). In a contract relating to plastics. It Is stated that aachlnery must be bought back or destroyed. 15 This .Is clearly very restrictive since the local firm, whether or not It has Increased Its Innovative capabilities. Is confronted with a dilemma, which leaves It exactly where It started: either It loses Its position In the tnarket• or it continues paying royalties to maintain a contractual rel~tlonshlp which under these circumstances becomes a necessary condition to assure Its permanence and stab II I ty. "that Is • It be 1 ong s to the 
**Analysis**
The text appears to be discussing contracts and agreements related to the manufacturing and production of various goods, including wood, concrete mixers, electrical materials, and plastics. The language used is focused on the terms and conditions of these contracts, including the purchase and sale of machinery, and the payment of royalties. The text also touches on the implications of these contracts for the local firm, including the potential for restrictive clauses that can limit its ability to innovate and operate. Based on this analysis, it seems likely that the text is related to the field of industry, specifically manufacturing and production.

**Category**
Industry