21. There are skilled personnel and spectacular machines that symbolize the incredible power of drugs and modern medicine to cure or alleviate illness. 22. Even if very skilled personnel conducted the tests arsenic up to a concentration of 500 ppb could be measured under the method. 23. These zvenya too adhered to the principle of a fixed skeleton of skilled personnel during the year with a fluctuating periphery of labourers. 24. Medical-examiner systems come with their own set of problems, not the least of which is the shortage of highly skilled personnel . 25. Such enterprises require highly educated, highly skilled personnel , descriptions that do not fit the vast majority of the city's unemployed. 26. Demianenko said Ukraine's nuclear plants have been plagued by a mass exodus of skilled personnel to Russia, where salaries are higher. 27. Because of poor distribution, " a large portion of our limited resource of skilled personnel has been wasted, " he said. 28. A trained Pilot is required for any foreign trade vessel, and the employment of these skilled personnel follows the law of supply and demand. 29. The M60 did best in aerial and static-defense roles where it could be stored in controlled conditions and regularly maintained by skilled personnel . 30. Firearms production at Jager ended by the early 1990s, according to the old owner Mr . Piscetta for " lack of skilled personnel ".