Variable frequency oscillation generators

Claim 1

APPARATUS FOR PROVIDING AT LEAST TWO FREQUENCY STABILIZED OSCILLATIONS COMPRISING A SINGLE STABLE FREQUENCY SOURCE OF OSCILLATION, HARMONICS OF SAID STABLE FREQUENCY, TEN ELECTRIC WAVE FILTERS EACH OF WHICH ARE FED FROM THE SAID SINGLE SOURCE AND EACH OF WHICH ARE ADAPTED TO PASS A DIFFERENT HARMONIC OSCILLATION, SAID OSCILLATIONS BEING RELATED BY A COMMON FREQUENCY DIFFERENCE, SWITCHING MEANS CONNECTED TO SAID FILTERS FOR SELECTING AT LEAST TWO OF THE SAID HARMONIC OSCILLATIONS PASSED BY THE ELECTRIC WAVE FILTERS, SAID SWITCHING MEANS COMPRISING A FIRST SWITCH HAVING A FIRST TEN-POSITION BANK AND A SECOND TENPOSITION BANK AND A SECOND SWITCH HAVING A FIRST TENPOSITION BANK AND A SECOND TEN-POSITION BANK, A FIRST OUTPUT TERMINAL CONNECTED TO SAID SECOND SWITCH AND A SECOND OUTPUT TERMINAL CONNECTED TO SAID FIRST SWITCH, A DECADE FREQUENCY DIVIDER CONNECTED BETWEEN THE SECOND SWITCH AND THE FIRST OUTPUT TERMINAL, THE FIRST SWITCH INCLUDING MEANS FOR SELECTING ONE HARMONIC FROM ITS FIRST BANK AND ONE HARMONIC FROM ITS SECOND BANK AND SUPPLYING SAID HARMONICS TO THE SECOND BANK OF THE SECOND SWITCH, THE SAID TWO SELECTED HARMONIC OSCILLATIONS BEING RELATED TO EACH OTHER BY SAID COMMON FREQUENCY DIFFERENCE, THE SECOND BANK OF THE SECOND SWITCH SELECTIVELY SUPPLYING TO THE FIRST OUTPUT TERMINAL ONE OR THE OTHER OF SAID TWO SELECTED HARMONIC OSCILLATIONS AND THE FIRST BANK OF THE SECOND SWITCH SUPPLYING TO THE SECOND OUTPUT TERMINAL A SELECTED ONE OF THE HARMONIC OSCILLATIONS BY WAY OF THE SAID DECADE FREQUENCY DIVIDER.