PATENT SPECIFICATION No. 370981.
APPLICATION DATE: January 13, 1931.
SPECIFICATION ACCEPTED: April 13, 1932.
TITLE: IMPROVEMENTS IN OR RELATING TO ELECTRIC BATTERY LAMPS.
APPLICANT: THE GENERAL ELECTRIC COMPANY LTD and SYDNEY WILLIAM RICHARDS both of Magnet House, Kingsway, London WC2.
Size: 195mmx270mm.
No. of pages of text: 6.
No. of pages of drawings: 1. Size of page of drawing/s: 300mmx225mm.
Brief Description of Patent: This invention relates to electrical apparatus for controlling the detonation of explosive charges, and although the invention may find application elsewhere it is of particular use in connection with coal mines where at the present time magneto generators are used for controlling the detonation of the of the explosive charges employed in the art of mining coal.
Condition: Slight crinkling. Wear to left hand edge where patent has been removed from the volume.
This was sold by a Library and has their stamp impression on some of the pages/drawings. Multiple Item Postage: Patents can be combined for postage costs, the cost is the same whether you purchase one or several, so check out our Ebay Shop patent listings as well. This patent specification has been disbound from a volume of 100 different patents. This is an original HMSO published item at the time, not a modern copy as are being sold elsewhere. The drawings are often ideal for framing. It is part of a collection of several volumes from the 1893-1900,1907 & 1920/50's that I have from which individual patents will be sold over the next few years.