# Relationship history for MSHA mine 1507374

Current hierarchy: **Armstrong W H → Rocky Top Energies Inc → Genex/Greer No 1 Surface**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Greer Inc → Genex/Greer No 1 Surface; 1974-10-01 to 1976-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Ridnouer O V → Genex/Greer No 1 Surface; 1974-10-01 to 1976-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Ridnouer O V → Greer Inc; 1974-10-01 to 1976-01-09; source msha-controller-operator-history
- **operator_operates_mine:** Genex-Greer Inc → Genex/Greer No 1 Surface; 1976-01-10 to 1978-10-24; source msha-controller-operator-history
- **controller_controls_mine:** General Exploration Company → Genex/Greer No 1 Surface; 1976-01-10 to 1978-10-24; source msha-controller-operator-history
- **controller_controls_operator:** General Exploration Company → Genex-Greer Inc; 1976-01-10 to 1978-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Top Energies Inc → Genex/Greer No 1 Surface; 1978-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Armstrong W H → Genex/Greer No 1 Surface; 1978-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Armstrong W H → Rocky Top Energies Inc; 1978-10-25 to current/open; source msha-controller-operator-history