Abstract: A mechanical touch fastener assembly (10,101) including two longitudinally continuous tapes (16), (18) carrying engaged fastener patches (12,12a), (14,14a,14b,14c). The first tape (16) carrying a series of first fastener patches (12,12a) arranged in a row along a length of the tape (16) and carrying a field of touch fastening features. Each first patch longitudinally spaced from adjacent first patches (12,12a). The second tape (18) carrying a series of second fastener patches (14,14a,14b,14c) carrying a second field of touch fastening features. The first (16) and second (18) tapes including a release liner (22), (24). The first (16) and second (18) tapes wound together to form a roll (60), with each of the first fastener patches (12,12a) releasably engaged to a respective one of the second fastener patches (14,14a,14b,14c) by inter-engagement of the first and second touch fastening features.

Abstract: The apparatus of the invention is applicable to gasholders and comprises a mercury seal, e.g. for a gas holder, which seal provides fluid-tight sealing in an annular space formed between a cylinder and a piston. The mercury is deposited in a reservoir which is inside the piston but which communicates with the annular space outside the piston. In the reservoir, the mercury is subjected to the inside pressure P of the cylinder, and it moves up inside the annular space when the difference between the inside and outside pressure P and Po increases, thereby forming an adaptive fluid seal.