671797-A is referenced by 3 patents.
671,797. Mowing machines. INTERNATIONAL HARVESTER CO. June 27, 1950, No. 16022/50. Class 6(iii) In a tractor-mounted mowing-machine, of the type wherein the cutting-mechanism 21 is swingably mounted on a vertical pivot 22 to permit deflection by rigid obstructions, the swinging is resisted by a resiliently-extensible element 32, 34 housed in a tubular frame member 12. The element comprises a spring 34 joined at its end, by a cable 32, to the swingable frame 19 carrying the cutting-mechanism 21. The member 12 has a hole 29 in its end for the passage of the cable 32.