- Object number6208.7.1
- TitleCaptain E.D. Carden's Letters Patent Agreement
- DescriptionDuplicate agreement between the Secretary of State for War and Capt Carden regarding Carden's invention - "an Improved method of and means for determining the electrical characteristics of High Frequency Oscillation Circuits". Signed by Lord Kitchener.
- Date1914 - 1914
- Production periodWorld War One, 1914-1918
- Dimensions
- Height: 378 mm
- Width: 243 mm