# Relationship history for MSHA mine 1401568

Current hierarchy: **Deffenbaugh Holdings Group → Shawnee Rock Company → Lone Elm 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Deffenbaugh Holdings Group → Lone Elm Quarry; 1989-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** O'Donnell & Sons Construction Company Inc → Lone Elm Quarry; 1993-04-01 to 1994-01-30; source msha-controller-operator-history
- **controller_controls_mine:** John J O'Donnell → Lone Elm Quarry; 1993-04-01 to 1994-01-30; source msha-controller-operator-history
- **controller_controls_operator:** John J O'Donnell → O'Donnell & Sons Construction Company Inc; 1993-04-01 to 1994-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Shawnee Rock Company → Lone Elm Quarry; 1994-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deffenbaugh Holdings Group → Shawnee Rock Company; 1994-01-31 to current/open; source msha-controller-operator-history