New Hampshire Bankers Ass'n v. Nelson

holding that a radio installed in a locomotive to provide two-way communication between the engine and yard employees was an “appurtenance” within the meaning of the Boiler Inspection Act. | the fact that one acts in the capacity of an independent contractor does not preclude a finding that a work was done for hire | additions “too insubstantial” to induce owner to share copyright | radio; no ICC rule implicated | no contractual relationship between parties | no contractual relationship between parties | the “Three Little Pigs” case | radio; no ICC rule implicated