An umbrella hub is provided that includes a hub body and a plurality of slots. The compositions can include bendamustine or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable fluid which can include in some embodiments PEG, PG or mixtures thereof and an antioxidant or chloride ion source. The cameras are oriented radially inward relative to the curved portion of the camera mount, such that the lines of sight of the cameras intersect. In a writing pass an image of said modulator is projected on said work piece. Data for each of at least one input field is identified based on the received speech and the generated grammar. Two ends of each of the integral units are respectively connected to two main buses that are provided in an upper position and a lower position while the disconnectors are interposed therebetween.