| skos:altLabel | - maintenance
- parallel
- tube
- Boiler
- Boiler safety
- Cochrane boilers
- Cornish boiler
- Fire-tube boiler#Locomotive boiler
- Horizontal Return Tubular boiler
- Iron tubular boilers
- Rectangular boilers
- boiler
- boiler barrel
- boiler tube
- boiler tubes
- boiler tubes in tube plates
- boilers
- cylindrical boilers
- fire tube
- fire tube boilers
- fire tube in the locomotive
- fire tubes
- fire-tube
- fire-tube boiler
- firetube
- firetube boilers
- firetubes
- horizontal return tube boiler
- locomotive boiler
- locomotive boilers
- locomotive type
- locomotive-type boilers
- massive boiler
- multi-flue boiler
- multi-flue internally fired boilers
- multi-tube boiler
- multi-tubular boiler
- parallel boiler
- taper boiler
- tapered boiler
- tubular boiler
- tubular boilers
- tubular firebox boiler
- vertical boiler
- washout plugs
- will be x-rayed
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