sabredog is correct and
has control.
The picture was at the Loening Aeronautical Engineering Corporation factory at 31st St and the East River. That area has been swallowed by the New York Univ. School of Medicine. Leroy Grumman was Loening's general manager when the picture was taken. Jake Swirbul was plant manager.
When Keystone took over, it announced that the Manhattan factory would close. Grumman, Swirbul and others left and formed the Grumman Aircraft Engineering Corp. One of Grumman's early products was the JF Duck, which appeared the 1933. The J2F (below) was a development.
