| | Mary and Frank Calandra, Sr., parents of Jennmar's two common stockholders, Jack Calandra and Frank Calandra, Jr., originated Frank Calandra, Inc. as a proprietorship in 1922. Jennmar was incorporated in 1965 and from 1922 until 1972 was engaged in various businesses related to the coal mining industry. In 1972, Jennmar began to change the primary focus of its business to the manufacturing of roof support systems. Jennmar's first step was the purchase of the manufacturing machinery necessary to begin producing steel mine roof bolts in Cresson, Pennsylvania. | |
