# Relationship history for MSHA mine 3607353

Current hierarchy: **Herrold Keith A → K & H Coal Dredging → K & H Coal Dredging**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** G Flanders Keller → K & H Coal Dredging; 1982-08-01 to 1996-06-27; source msha-controller-operator-history
- **controller_controls_mine:** Keller G Flanders → K & H Coal Dredging; 1982-08-01 to 1996-06-27; source msha-controller-operator-history
- **controller_controls_operator:** Keller G Flanders → G Flanders Keller; 1982-08-01 to 1996-06-27; source msha-controller-operator-history
- **operator_operates_mine:** K & H Coal Dredging → K & H Coal Dredging; 1996-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Herrold Keith A → K & H Coal Dredging; 1996-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Herrold Keith A → K & H Coal Dredging; 1996-06-28 to current/open; source msha-controller-operator-history