# Relationship history for MSHA mine 4606330

Current hierarchy: **Timothy  Schwinabart; Ted  Schwinabart → Beryl Coal Company → Beryl Tipple**

- 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:** Beryl Coal Company → Beryl Tipple; 1981-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ted  Schwinabart et al → Beryl Tipple; 1981-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Schwinabart et al → Beryl Coal Company; 1981-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Schwinabart et al → Beryl Coal Company; 1981-03-01 to current/open; source msha-controller-operator-history