Nikola Tesla U.S. Patent 725,605 - System of Signaling Patent Wrapper Page 51

lameredes E milled per Subſt 'want 15 Room 91. In the matter of the application of Nikola Tesla, filed July 16, 1900, Serial No. 23,847, Systems of Signalling. Hon. Commissioner of Patents, Socks Sir:- hereby amend as follows: In the matter of the application above named we Cancel lines 14 to.16 on page 9 and insert: "the system e s d4 by periodically short circuiting, through an induction coil 13 and a rotating disk D4, with insulating and conducting segments, a circuit p4 in inductive relation to said system". Cancel claim 9, and substitute as follows: ng. In a receiving apparatus, the combination of a plurality of sensitive circuits, severally tuned to respond to waves or impulses of a different kind or class, a receiving circuit controlled by the sensitive circuite and a device connected with the receiving circuits adapted to be operated when said circuit is completed by the conjoint action of two or more of the sensitive circuits, as set forth. New York, December 26, 1901. It is thought that the claim as thus amended clearly differentiates the invention from the references, as we know of no instance in which a plurality of differently tuned sensitive circuits have been employed in this -1665