What happened April 1973 AD

On April 3, 1973, Martin Cooper, a Motorola researcher and executive, made the first mobile telephone call from handheld subscriber equipment, placing a call to Dr. Joel S. Engel of Bell Labs, his rival. The prototype handheld phone used by Dr. Cooper weighed 1.1 kilograms (2.4 lb) and measured 23 by 13 by 4.5 centimetres (9.1 by 5.1 by 1.8 in). The prototype offered a talk time of just 30 minutes and took 10 hours to re-charge.

Pablo Picasso died on 8 April 1973 in Mougins, France from pulmonary edema and heart failure.

U.S. Government ends Mandatory Oil Import Program. The program, established in 1959 by President Eisenhower, had limited imports of crude and product east of the Rocky Mountains to a percentage of domestic crude production.

On April 20, 1973, Bufalino was arrested in a Scranton night club in an FBI raid, charged with interference with interstate commerce, obstruction of justice, gambling and transporting stolen property, but later released in $50,000 bail.

Bergoglio completed his final stage of spiritual training as a Jesuit, tertianship, at Alcalá de Henares, Spain. He took the final fourth vow (obedience to the pope) in the Society of Jesus on 22 April 1973.