Artifact Details Title Schmitt Trigger 1503 C system building block Catalog Number 102729753 Type Physical object Description The object is a board with various active and passive components surrounded by an aluminum frame and blue plastic 22 pin male connector. There are two round inspection stamps on the component side. Date 1963 ca. Manufacturer Digital Equipment Corporation (DEC) Place Manufactured Maynard, Mass. Identifying Numbers Model number 1503 C Printed on the solder side at the insertion end Part number 1503 Engraved on the face of the aluminum frame Serial number 0248538 Engraved on the side of the aluminum frame Dimensions overall: 1/2 in x 7 in x 4 1/2 in Category Component/module