of an edge-belt for holding and transporting film has been proposed in the prior art, but it is believed such proposals were not particularly successful, and have not achieved significant use in automatic processing machines. In gripping the film along an edge, such early belt systems were subject to the problems of, zones of non-development and uneven development, and film damage due to contact along the edge and problems in control of tension in the gripping force.Testicular nonseminoma and seminoma in relation to perinatal characteristics.
Testicular cancer incidence peaks during the third decade of life, and an increasing trend in the occurrence of this disease has been seen in many countries. Few risk factors have been established for testicular cancer, but evidence suggests that causal factors operate early in life, perhaps even in utero. We performed a case-control study to evaluate specific perinatal characteristics as risk factors for the two main histopathologic types of testicular cancer: seminomas and nonseminomas. Two hundred thirty-two case patients with invasive testicular cancer and 904 individually matched control subjects (all singleton births), nested in a cohort of men born at 10 hospitals in Sweden from 1920 through 1978, were included in the study. Perinatal information about the study subjects and