Wagner Electric Corporation

John P Maxwell

John M Ury

A control valve for selectively establishing connections between the spring applied parking brake in an air braked vehicle and either the parking brake air reservoir or the exhaust port of the control valve, and incorporating a lock which enables the operator to secure the control valve in the position in which the parking brakes are applied.

Locking dashboard control valve

An improved chart carrier for a recorder permitting use with a take-up spool for relatively long periods of time, and without the take-up spool for shorter periods of time, a cylindrical enclosure being employed for rolling and enclosedly retaining the used portion of the chart in a predetermined portion of the chart carrier.

Growing community of inventors

Chatham, NJ, United States of America

John P Maxwell