To obtain such positron microbeam, it is necessary to use objective lenses, which are commonly used in the electron microscopy. We also attempted to form the positron microbeam using a positron beam for the positron diffraction experiment and a SEM optics [6]; [7] ; [8].
Publicly Traded Companies that Benefited from Forced or Slave Labor, 1929-1945 CalPERS
Contrary to views espoused by critics of the system at the time, slave labor was productive. Slaveholders in the South extracted sufficient labor from their slaves to produce a considerable surplus each year. They did this with a combination of coercion and incentives that implies a very close control of labor by the master.