1. The present invention is advantageous in that the air interchanger (100) can be easily mounted and demounted.

2. In the first half of the 1960s this aerial mast was demounted and the current installation built.

3. Nowadays this mast is demounted and there are only small aerials for mobile phone services on its top.

4. Circumferentially traveling type tire mounting device US2895519A (en) * 1956-07-25: 1959-07-21: Gilbert E Coats: Wheel supporting and clamping apparatus US2912047A (en) * 1956-04-09: 1959-11-10: Arthur W Douglas: Circumferentially traveling type tire mounting and demounting device US2923347A (en) *

5. The present invention relates to a ventilation apparatus for a sliding window, and more particularly, to a ventilation apparatus for a sliding window, which has improved easiness of mounting/demounting, enhanced airtightness/watertightness and thermal insulation, and improved shielding against external contaminants.