| http://www.w3.org/ns/prov#value | - said vacuum chamber second open end, and including a vacuum pump therein with a pump lever operative with said vacuum pump and extending from said pump housing so as to be accessible for selective actuation by a user; wherein said vacuum pump includes a piston having a piston head with a circumferential resilient skirt for sealing against a cylinder wall and creating a vacuum within such cylinder
|
