Improvements in Charts of the Successive Relative Positions of Two Moving Objects and in Means for Charting the said Positions.
Fecha de publicación:
21/11/1907
Fuente: WIPO "pollen"
4311. Pollen, A. H., and Isherwood, H. Feb. 21. Protractors.-The arm 108 swinging round the pivot 114 sets out the angle indicated on a quadrant 107.