A vacuum pump for a seed planter includes a housing, an impeller rotated within the housing, and a motor or other drive. In one embodiment, the lighting system includes a display screen and a frame that is designed to be reversibly coupled around the display screen. One of the rods is spaced from the mentioned door, while a second one is located in a position somewhat retracted from that door. The method further includes determining at least one TTI bundling parameter based on the TTI bundling configuration and the uplink grant. The first straight portion 31c is located on a straight line L1 perpendicular to a plurality of first tangent lines to spirals 22, 42 at a plurality of respective intersection points with the spirals 22, 42. Further, a signal can be detected based on the level slice system and detection delay time can be reduced by using a mark position form having a large detection margin as an information recording system of the header field.