Abstract: An electronic device can include a housing defining an aperture and a display positioned in the aperture. The display and the housing can define an internal volume in which a speaker assembly is positioned. The speaker assembly can include a speaker module and a speaker enclosure in fluid communication, with the speaker enclosure at least partially defining a speaker volume.

Abstract: A multi-electron beam system that forms hundreds of beamlets can focus the beamlets, reduce Coulomb interaction effects, and improve resolutions of the beamlets. A Wien filter with electrostatic and magnetic deflection fields can separate the secondary electron beams from the 5 primary electron beams and can correct the astigmatism and source energy dispersion blurs for all the beamlets simultaneously.

Abstract: An impact tool is disclosed comprising a striking head, such as a hammer (claw, ball peen, ripping or sledge), axe or adze, having a handle-receiving socket extending therethrough with walls tapering toward the handle-receiving opening. The head has aligned holes in two opposite walls adjacent to the handle receiving opening. A handle has a head portion inserted in the socket and a handle portion. The handle head portion has a plurality of gripping surfaces engaging the walls of the socket and a laterally extending hole aligned with the handle head holes. Securing means, such as a two-piece holding screw, bolt, or rivet extends through the aligned handle head and striking head holes and a setting-type plastic resin, such as an epoxy or polyurethane resin, fills the space around the handle head portion in the socket to the end of the socket opposite the handle-receiving opening to secure the striking head against dislodgement during use.