# Relationship history for MSHA mine 4606687

Current hierarchy: **Tracy W  Hylton II → Tammie Lynn Coal Company → #3 Surface Mine**

- 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:** Poe Corp → #3 Surface Mine; 1983-08-01 to 1987-10-05; source msha-controller-operator-history
- **controller_controls_mine:** Garland George Sr → #3 Surface Mine; 1983-08-01 to 1987-10-05; source msha-controller-operator-history
- **controller_controls_operator:** Garland George Sr → Poe Corp; 1983-08-01 to 1987-10-05; source msha-controller-operator-history
- **controller_controls_mine:** Tracy W  Hylton II → #3 Surface Mine; 1985-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tammie Lynn Coal Company → #3 Surface Mine; 1987-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tracy W  Hylton II → Tammie Lynn Coal Company; 1987-10-06 to current/open; source msha-controller-operator-history