Artifact Details

Title

IBM 1720 SMS mercury-wetted switches

Catalog Number

X1069.91

Type

Physical object

Date

1959

Manufacturer

International Business Machines Corporation (IBM)

Place Manufactured

U.S.

Identifying Numbers

Other number 396975 Printed on bottom of board.
Other number 804 Engraved on top of board
Other number ERK 374494 Engraved on top of board
Other number XE07 Handwritten on top of board
Serial number YB124835

Dimensions

overall: 1/4 in x 4 1/2 in x 2 5/8 in

Description

Written on a scrap of paper next to board was "79.80."
Letter in paper file excerpt, "They are switches from the 1720, a prototype of IBM's first entry into process control systems. The 1720 was installed at three test locations in 1959 and 1960; The AMOCO refinery in Whiting, Indiana, an acrylo-nitrile pilot plant of DuPont in Wilmington, Delaware, and at the Standard Oil Refinery in El Segundo, California. The 1920 prototype system was followed by the 1710 and 1800 products in the 1960s."

Category

Component: circuit board / module

Credit

Gift of Howard L. Funk

Lot Number

X1069.91