According to the invention, at least two respective inlets and outlets (10; 11; 12, 13) are provided for the liquid, being arranged, respectively, opposite each other in pairs on a specific height.

Said phase-shifted signals feed in pairs four mixers.

The anchoring devices include axial and radial claw clamping devices which are associated by pairs and manoeuvred by pairs using a same and single lever (58, 95).

According to the invention, the extension panels (3) are paired.

Each two of the guide surfaces (15) are disposed as a pair.

angle measurement in all combinations

the two carbons have at least one of those substituents in common

T2, T'2n) arranged in pairs to form two arms (B1, C1 ...

The invention relates to a heat exchanger which includes prestamped metal plates (1, 2) assembled, by welding, two-by-two on two opposite sides thereof so as to form stacked modular elements defining two separate circuits for two fluids, respectively.

The linear portions (1101... 1105) are not mutually parallel with their neighbours.

Each two drive chains (11 to 14) are mounted in pairs in a guide track (22, 23).

The respective forward and rear orthodontic bands are interconnected by an expansion sheath element (34, 36).

The division circuit therefore consists of four parts, with two symmetrical pairs.

Every two radiating fins (11) are covered on each other to form a radiating shell (1).

The shields (6, 7, 9) are hinged in pairs by at least one connection to a spherical contact central point.

The patterned sliding blocks (2) are comprised of several geometrical elements (20) and any two of these elements (20) can be engaged with each other.