1
Clay Edward Hartley: Improvements in and relating to gear boxes. Clay Edward Hartley, August 23, 1972: GB1286279-A (3 worldwide citation)

1286279 Variable speed gearing E H CLAY 21 Nov 1969 57153/69 Addition to 1055987 Heading F2D The gearing of parent Specification is subject to the following modifications:-(a) the fixed gear is a ring gear 45; (b) the connection between the one differential gear shaft 5 and the fixed gear is via a t ...


2
Clay Edward Hartley: Improvements in and relating to gear boxes. Clay Edward Hartley, August 31, 1972: GB1287236-A

1287236 Variable speed gearing E H CLAY 21 Nov 1969 13848/71 Divided out of 1286279 Addition to 1055987 Heading F2D The gearing of the parent Specification or of Specification 1286279 in which all the gears are spur gears and all the shafts are parallel.


3
Clay Edward Hartley: Improvements in and relating to gear boxes. Clay Edward Hartley, August 31, 1972: GB1287237-A

1287237 Variable speed gearing E H CLAY 21 Nov 1969 13849/71 Divided out of 1286279 Addition to 1055987 Heading F2D The gearing of the parent Specification with or without the modifications of Specifications 1,285,279 and 1,287,236, in which the output epicyclic gearing is a bevel gear differential ...