# Relationship history for MSHA mine 1515680

Current hierarchy: **Smith Robert L Jr & Henry Campbell → Abraham Coal Company → #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:** Three X Coal Company → #1; 1986-07-01 to 1989-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Patterson Dan & Darrel Teauge → #1; 1986-07-01 to 1989-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Patterson Dan & Darrel Teauge → Three X Coal Company; 1986-07-01 to 1989-07-09; source msha-controller-operator-history
- **operator_operates_mine:** C & H Mining → #1; 1989-07-10 to 1992-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Hubbard  et al → #1; 1989-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Hubbard  et al → C & H Mining; 1989-07-10 to 1992-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Lloyd  Cole  et al → C & H Mining; 1989-07-10 to 1992-07-21; source msha-controller-operator-history
- **operator_operates_mine:** Abraham Coal Company → #1; 1992-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Robert L Jr & Henry Campbell → #1; 1992-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Robert L Jr & Henry Campbell → Abraham Coal Company; 1992-07-22 to current/open; source msha-controller-operator-history