Abstract: A track element includes a base having a first side and a second side opposing the second side, the first side of the base defining a set of wheel engagement elements and the second side of the base defining first and second locking block receptacles at the first and second ends of the base, respectively. The track element includes a first track element connector disposed at the first end of the base and a second track element connector disposed at the second end of the base. The first locking block receptacle is configured to receive a first locking block to define a first support for a first track piece and the second locking block receptacle is configured to receive a second locking block to define a second support for a second track piece.

Abstract: A track element includes a base having a first side and a second side opposing the second side, the first side of the base defining a set of wheel engagement elements and the second side of the base defining first and second locking block receptacles at the first and second ends of the base, respectively. The track element includes a first track element connector disposed at the first end of the base and a second track element connector disposed at the second end of the base. The first locking block receptacle is configured to receive a first locking block to define a first support for a first track piece and the second locking block receptacle is configured to receive a second locking block to define a second support for a second track piece.

Abstract: An filter, apparatus and method for preparing microscope slides is presented. After filtration of the specimen is performed, the filter containing the filtrand is configured to be microscopically examined. The filter may either be affixed to a microscope slide or, in an embodiment, the filter may be incorporated into a microscope slide.

Abstract: An filter, apparatus and method for preparing microscope slides is presented. After filtration of the specimen is performed, the filter containing the filtrand is configured to be microscopically examined. The filter may either be affixed to a microscope slide or, in an embodiment, the filter may be incorporated into a microscope slide.

Abstract: An apparatus for performing a work operation on sheet material includes a plurality of drive wheels for driving the sheet material in cooperation with a plurality of pinch rollers along a feed path. Each of the drive wheels includes a drive surface having a plurality of primary teeth and a plurality of secondary teeth. Each primary tooth includes a top surface and a plurality of primary contact points to engage the sheet material. Each secondary tooth includes either a secondary contact line or a secondary contact point that come into contact with the sheet material to provide additional driving force and to prevent the sheet material from being perforated by the primary teeth. The primary teeth and the secondary teeth of the drive wheels engage the sheet material to advance the sheet material along the feed path. The drive surface of the drive wheels of the present invention minimizes slippage of the sheet material in the drive apparatus without damaging the sheet material.