A slide type electronic device includes a first device body, a second device body stacked on the first device body, and a slide mechanism provided between the first and second device bodies. The medical connector also contains a cover preferably having first and second caps coupled together by a first tether, and a fastener coupled to at least one of the first and second caps by a second tether. The lens body includes a plurality of lens parts and a plurality of light guiding parts for reflecting the light by inside surfaces of the light guiding parts. A second fluid reservoir H is formed between the sleeve 1 and the seal cap 5. To carry out the levelling operation the floor levelling vehicle comprises at least one grinding tool which is provided and driven to remove an amount of material from the floor, and at least one additional polishing device provided at a position behind the back displacement members in moving direction of the levelling vehicle.