Abstract: Multicylinder internal combustion engine of the type having a crankshaft and a block comprised of first and second mating half sections joined in a common plane which passes through and along the axis of the crankshaft. The half sections provides a crankcase crankshaft bearing support and cylinder portions. A unitized cylinder head and sleeve construction is provided. A cooperative securing mechanism is provided for securing the unitized cylinder head and sleeve construction to the engine block.

Abstract: Equipment for installing apparatus at an elevated location at a site comprising an aerial lift and a crane located at the site. Each of the aerial lift and the crane comprises a vehicle, a boom structure mounted on the vehicle and control means for the boom structure whereby the outer extremity of each of the boom structures can be rotated about a vertical axis raised and lowered about a horizontal axis and moved toward and away from the vehicle. At least one of the boom structures has a workman's bucket carried thereby. The other of the boom structures has the capability of lifting apparatus to an elevated location.

Abstract: Aerial lifting equipment having a platform, a support structure and means rotatably mounting the support structure upon the platform for rotation about a substantially vertical axis. A boom structure is mounted on the support structure for movement about a substantially horizontal axis and drive means is mounted upon the platform and the support structure for causing rotation of the support structure about the vertical axis. The drive means includes a track structure mounted in a fixed position on the platform. The drive structure has a circular track surface and at least three spaced friction members adapted to engage the drive surface. Motive means is provided for driving at least one of the friction members. The motive drive means includes planetary gearing within one of the friction members. Preloading means is provided for applying preloading forces to the one friction drive member to yieldably urge it into engagement with the circular drive surface.