# Relationship history for MSHA mine 1512819

Current hierarchy: **Lombardo Sonny & Komas D Bryant → Sonnyco 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

- **operator_operates_mine:** Rowe & Ward Coal Company Inc → No 1; 1981-04-01 to 1983-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth  Rowe → No 1; 1981-04-01 to 1983-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Rowe → Rowe & Ward Coal Company Inc; 1981-04-01 to 1983-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Sonnyco Coal Company → No 1; 1983-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lombardo Sonny & Komas D Bryant → No 1; 1983-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lombardo Sonny & Komas D Bryant → Sonnyco Coal Company; 1983-11-14 to current/open; source msha-controller-operator-history