abstract: seed delivery apparatus, systems, and methods referring to drawings, wherein like reference numerals designate identical or corresponding parts throughout the various views, fig. 1 illustrates a side elevation view of a single row unit (10) of a conventional row crop planter such as the type disclosed in u.s. patent no. 7,438,006, the disclosure of which is hereby incorporated herein in its entirety by reference. as is well known in the art, the row units (10) are mounted in spaced relation along the length of a transverse toolbar (12) by a parallel linkage (14), comprised of upper and lower parallel arms (16, 18) pivotally mounted at their forward ends to the transverse toolbar (12) and at their rearward end to the row unit frame (20). abstract of patent summary: "seed delivery methods, systems and apparatus". Referring to the drawings, in which similar numerical references designate identical or corresponding parts throughout the various views, Figure 1 illustrates a side elevation view of a single row unit (10) of a conventional row crop planter such as type disclosed in U.S. Patent No. 7,438,006, the disclosure of which is incorporated herein by reference in its entirety. As is well known in the art, row units (10) are spaced apart along the length of a transverse tool bar (12) by means of a parallel connection (14) composed of upper and lower parallel arms ( 16, 18) rotatably mounted at their front ends relative to the transverse tool bar (12) and at their rear end relative to the row unit frame (20).abstract: seed delivery apparatus, systems, and methods referring to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views, fig. 1 illustrates a side elevation view of a single row unit (10) of a conventional row crop planter such as the type disclosed in u.s. patent no. 7,438,006, the disclosure of which is hereby incorporated herein in its entirety by reference. as is well known in the art,
