While there may be some lenses converted from Ektar mount to LTM, a number were made in LTM originally.
During WWII, the US Signal Corps commissioned designs for a Leica copy to fill the void left by the unavailability of "the real thing". Several manufacturers developed designs. Premier Instrument Co.'s offering was the Kardon, a very nice copy. Rather than develop their own lens, they bought lenses from Kodak, the Ektar 47mm f/2, in LTM.
The Signal Corps project was a bust as such things go. By the time that contract decisions were made and production could start the war was nearly over. Some Signal Corps samples were delivered, but most were the civilian model that was sold after the war for a few years.