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The Clinometer, Large was used on siege guns such as 9.2-in howitzers and 9.2-in BL guns. As for value the ones made by E R Watts & Son were costed at £14.17.6 in a January 1915 contract for quantity 50.
E.R. Watts & Sons, 123 Camberwell Road, SE5 - One of our finest optical manufacturers, especially after merging post WWII, with Adam Hilger Ltd., to form Hilger & Watts, whose customers included Boeing and NASA.
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