# Relationship history for MSHA mine 1515678

Current hierarchy: **Edward  Groves → Edco Energy Corp → No 1**

- 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:** Donico Coal Inc → No 1; 1986-07-01 to 1986-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Collins Don → No 1; 1986-07-01 to 1986-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Collins Don → Donico Coal Inc; 1986-07-01 to 1986-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Edward  Groves → No 1; 1986-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T R & H Development Inc → No 1; 1986-09-24 to 1987-09-15; source msha-controller-operator-history
- **controller_controls_mine:** Robert C  Ratliff → No 1; 1986-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Ratliff → T R & H Development Inc; 1986-09-24 to 1987-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Edco Energy Corp → No 1; 1987-09-16 to 1987-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Groves → Edco Energy Corp; 1987-09-16 to 1987-09-29; source msha-controller-operator-history
- **operator_operates_mine:** Rayon Mining Corp → No 1; 1987-09-30 to 1988-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Jack → No 1; 1987-09-30 to 1992-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Jack → Rayon Mining Corp; 1987-09-30 to 1988-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Edco Energy Corp → No 1; 1988-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Groves → Edco Energy Corp; 1988-07-12 to current/open; source msha-controller-operator-history