# Relationship history for MSHA mine 1512993

Current hierarchy: **Robinson Miles & Bobby → Robinson Brothers Coal Company → 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

- **controller_controls_mine:** William M  Deskins et al → No 1; 1980-10-01 to 1984-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Mc Kinley Corp → No 1; 1981-07-01 to 1984-03-22; source msha-controller-operator-history
- **controller_controls_operator:** William M  Deskins et al → Mc Kinley Corp; 1981-07-01 to 1984-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Robinson Brothers Coal Company → No 1; 1984-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robinson Miles & Bobby → No 1; 1984-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robinson Miles & Bobby → Robinson Brothers Coal Company; 1984-03-23 to current/open; source msha-controller-operator-history