A solid oxide fuel cell stack incorporates metallic interconnects (14, 14a) each of which includes a fuel intake manifold (30), a fuel exhaust manifold (32), an oxidant intake manifold (34) and an oxidant exhaust manifold (36).

A building evacuation system in which at least one vertical evacuation chute is provided for each floor of a building to be evacuated.

The coolant supply manifold (12) and coolant discharge manifold (13) are connected by two bypass passages (14a, 14b).

The rescue sleeve (18) is foldable between a compact, standby position and an extended, sloping down to ground level position.

The Norwegian Petroleum Museum illustrates the oil industry with submarine displays, a large drill and a rescue chute.

An internal waste evacuation chute extends from the interior of the hollow cutting nose and through the shaft for evacuating plugs of punched material from the nose.

A plurality of collapsible buckets are stored on each floor and, after loading, are slid along horizontal rails to the vertical chute where they engage a plurality of vertical guide tracks.

Means (92, 94) are provided for activating the ejection of the sleeve (18) from the standby position within a compartment (12) to the extended position.