This incineration furnace includes an internal exhaust tub (90), an external exhaust tub (80), an internal upper tub (60), an external upper tub (50), an internal lower tub (10), and an external lower tub (30).

A bi-metal composite tube comprising of an inner tube (10) and an outer tube (20).

A telescopic tube for a dust collector comprises an inner tube (1) and an outer tube.

Further, the tube might comprise an outer tube and an inner tube.

The positionable tube assembly (206) comprises a guide tube (214) and a positionable tube (216).

A composite pipe (10) comprises an inside pipe (39') and an outside pipe (37’).

Each arm assembly includes an outer housing tube (34), an intermediate tube (36), and an inner tube (30).

A plastic pipe to metal pipe coupling includes a metal pipe, a plastic pipe and a metal retaining collar.

The protection tube includes an outer rube (21) and an inner tube (22).

The lance (10) comprises outer (18), intermediate (42), and inner tubes (28).

An ozone generating pipe comprises an insulation pipe.

A tube (36) is connected to a different tube (27).

The discharge tube (11) has a double-tube structure including an outer tube (12) and an inner tube (13).

The device includes an outer tube and an inner tube.

The roll comprises an outer tube enclosing an inner tube.