The opening documents one anonymous preserved steel optical-air-surveillance tower in central Sweden, with an approximately 15 m ladder and a top observation cage. Most of the article is national system history: about 1,500 LS sites, manual telephone reporting, the 1958 tonsvarare line-test device, later OPUS automation, and eventual replacement by 600–700 LOMOS observation sites. It provides operating/device costs but no tower construction cost or drawings.

height_m: value: 15 | unit: m | scope: focal tower access ladder/approximate tower height | note: The article calls the ladder approximately 15 m high; exact overall tower height is not separately stated. | inner_structure: value: steel tower with ladder, heavy timber floor hatch and top observation cage | scope: anonymous focal tower | note: Cage and foundation dimensions are absent. | other: value: 1500 | unit: LS sites | scope: national optical-air-surveillance system | note: Approximate national count, not the focal tower count.; range: 600; 700 | unit: observation sites | scope: later LOMOS replacement system | note: Different generation and program; not geometry for the focal LS tower.

amount: SEK 21.60 per LS test | year: 1958 | basis: operating-cost comparison | scope: Existing field-visit method: SEK 16.60 labor/test plus SEK 5 travel, assuming at most five LS per day.; amount: SEK 1.60 per LS test | year: 1958 | basis: operating-cost comparison | scope: Tonsvarare method, based on 80 LS calls/day and SEK 128 total call-plus-wage cost.; amount: SEK 25 per unit | year: 1958 | basis: manufacturing price | scope: One tonsvarare line-test device; not tower construction cost.

Observation cage with compass plate and communications outlet; Manual telephone reporting with prioritized air-defence calls; Tonsvarare remote line-testing device; Later OPUS battery-powered data sender and LS telephone; National links from LS to LGC and onward to RRGC/LFC

Steel tower and foundation; Observation cage, hatch and ladder safety; Remote-site transport and erection; Telephone/data line and lightning protection; Portfolio-wide maintenance and line testing

One anonymous tower is photographed, but most quantities and costs refer to the national LS system or its successor. Unit tower cost and national telecom-program cost must be modeled separately.

Indeterminate

Tower type drawing and overall height; Cage plan and section; Steel member sizes and mass; Foundation dimensions and ground conditions; Access/erection route; Telecom and power scope; Historic tower construction cost

No linked dossier exists for the focal LS tower.; The index record for Anonymous preserved luftförsvarsgruppcentral describes an LGC command facility, not an LS tower, and must not be used as a mapping substitute.; The article mixes focal-tower observation, national LS history, OPUS and later LOMOS; their counts are non-additive.; Reader comments asking for drawings are not geometry evidence.