Employed around head office, not contracted out

• Not farmed out
• Like many company publications
• Produced by its own staff
• One with common sense bottling hydrogen - to begin with engineer's not outsourced
• Done by its own staffers
• Like some corporate publications
• Not done externally
• Heinous criminal using company's assets

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
also in-house , 1955, from in + house .