1960-05-03 12:14:16

History of call

1960-07-02 19:29:37

In the late 1970

1980-07-02 19:29:37

in 1980

1981-07-02 19:29:37

in 1981

1982-07-02 19:29:37

in 1982

by John Higgins

1984-04-10 22:30:43

in 1984

by the German Department of Aberdeen University

1986-04-10 22:30:43

on 1986

by Graham Davies

1993-04-10 22:30:43

on 1993

John Higgins

1995-04-10 22:30:43

on 1995

2018-04-10 22:30:43

Advantage of CALL