# Relationship history for MSHA mine 4703842

Current hierarchy: **Kevin W  Hahn → K&D Stone LLC → Center Road Quarry**

- 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:** Nelson Excavating and Son LLC → Center Road Quarry; 2019-04-15 to 2023-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Kevin W  Hahn → Center Road Quarry; 2019-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin W  Hahn → Nelson Excavating and Son LLC; 2019-04-15 to 2023-08-29; source msha-controller-operator-history
- **operator_operates_mine:** K&D Stone LLC → Center Road Quarry; 2023-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin W  Hahn → Center Road Quarry; 2023-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin W  Hahn → K&D Stone LLC; 2023-08-30 to current/open; source msha-controller-operator-history