Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Electricity, 2 canlyniadau
- Gas industry -- Great Britain, 2 canlyniadau
- Gas industry -- Wales -- Carmarthenshire, 2 canlyniadau
- Public utilities -- Great Britain, 2 canlyniadau
- Public utilities -- Wales -- Carmarthenshire, 2 canlyniadau
- Coal trade -- Great Britain, 1 canlyniadau
- Coal trade -- Wales -- Carmarthenshire, 1 canlyniadau