State joint boards; reference of communication matters; composition; jurisdiction, powers, duties, and obligations; conduct of proceedings; force and effect of joint board action; members: nomination, appointment, and rejection; allowances for expenses

State commissions; conferences with Commission regarding matters of carriers subject to their jurisdiction; joint hearings; cooperation with Commission

Federal-State Joint Board; reference of proceedings regarding jurisdictional separation of common carrier property and expenses between interstate and intrastate operations and other matters relating to common carrier communications of joint concern; jurisdiction, powers, duties, and obligations; recommendation of decisions; State members; presence at oral arguments and nonvoting participation in deliberations; composition; Chairman