Telescopic column comprising an outer tube and at least one first inner tube, the at least one first inner tube being telescopically movable relative to the outer tube, the at least one first inner tube being equipped with a sliding bearing, which comprises the following features: - a first sliding set which has a plurality of sliding elements (6 1, 6 2,..., 6 n) that are arranged between the first inner tube and the outer tube in a peripheral direction on the outer wall of the first inner tube, by means of which sliding elements the two tubes (2, 3) are guided in a longitudinally shiftable manner in relation to one another; - the sliding elements (6 1, 6 2,..., 6 n) of the first sliding set are fastened or attached to the first inner tube; - the sliding elements (6 1, 6 2,..., 6 n) of the first sliding set comprise sliding surfaces which are in contact with the inner wall of the outer tube; - at least some or all of the sliding elements (6 1, 6 2,..., 6 n) are custom-made and have a contact surface and/or sliding surface that is machined, milled and/or ground down to a specified material thickness, or a) at least some or all of the sliding elements (6 1, 6 2,..., 6 n) are custom-made and have a contact surface and/or sliding surface that is machined, milled and/or ground down to a specified material thickness, or b) a contact surface and/or sliding surface that is built up/printed to a specified material thickness by means of a 3D printer, wherein the specified material thickness being selected such that the movement play of the first inner tube relative to the outer tube is below a threshold value or is preferably free from play; characterised by the following features: - the first inner tube has, in the peripheral direction, a plurality of coding openings that are spaced apart from one another in a first row; - at least some of the coding openings of the first row differ from one another in the shape and/or size thereof; - at least some of the sliding elements (6 1, 6 2,..., 6 n) of the first sliding set are provided with coding projections (50 1, 50 2,..., 50 n); - the coding projections (50 1, 50 2,..., 50 n) of the sliding elements (6 1, 6 2,..., 6 n) of the first sliding set correspond, with respect to the shape, size and/or possibility thereof to be introduced into associated coding openings, to the shape and size of the respective coding openings of the first row such that the sliding elements (6 1, 6 2,..., 6 n) of the first sliding set can be fastened or are fastened only at the mounting positions intended therefor in the peripheral direction on the outer wall of the first inner tube. - a first sliding set which has a plurality of sliding elements (6 1, 6 2,..., 6 n) that are arranged between the first inner tube and the outer tube in a peripheral direction on the outer wall of the first inner tube, by means of which sliding elements the two tubes (2, 3) are guided in a longitudinally shiftable manner in relation to one another; - the sliding elements (6 1, 6 2,..., 6 n) of the first sliding set are fastened or attached to the first inner tube; - the sliding elements (6 1, 6 2,..., 6 n) of the first sliding set comprise sliding surfaces which are in contact with the inner wall of the outer tube; - at least some or all of the sliding elements (6 1, 6 2,..., 6 n) are custom-made and have a contact surface and/or sliding surface that is machined, milled and/or ground down to a specified material thickness, or a) at least some or all of the sliding elements (6 1, 6 2,..., 6 n) are custom-made and have a contact surface and/or sliding surface that is machined, milled and/or ground down to a specified material thickness, or b) a contact surface and/or sliding surface that is built up/printed to a specified material thickness by means of a 3D printer, wherein the specified material thickness being selected such that the movement play of the first inner tube relative to the outer tube is below a threshold value or is preferably free from play; a) at least some or all of the sliding elements (6 1, 6 2,..., 6 n) are custom-made and have a contact surface and/or sliding surface that is machined, milled and/or ground down to a specified material thickness, or b) a contact surface and/or sliding surface that is built up/printed to a specified material thickness by means of a 3D printer, wherein the specified material thickness being selected such that the movement play of the first inner tube relative to the outer tube is below a threshold value or is preferably free from play; - the first inner tube has, in the peripheral direction, a plurality of coding openings that are spaced apart from one another in a first row; - at least some of the coding openings of the first row differ from one another in the shape and/or size thereof; - at least some of the sliding elements (6 1, 6 2,..., 6 n) of the first sliding set are provided with coding projections (50 1, 50 2,..., 50 n); - the coding projections (50 1, 50 2,..., 50 n) of the sliding elements (6 1, 6 2,..., 6 n) of the first sliding set correspond, with respect to the shape, size and/or possibility thereof to be introduced into associated coding openings, to the shape and size of the respective coding openings of the first row such that the sliding elements (6 1, 6 2,..., 6 n) of the first sliding set can be fastened or are fastened only at the mounting positions intended therefor in the peripheral direction on the outer wall of the first inner tube.