# Relationship history for MSHA mine 1401570

Current hierarchy: **Harshman Construction LLC; DRB Construction LLC → South West Butler Quarry L L C → Plant 3 South West Butler Quarry LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** South West Butler Quarry L L C → Plant 3 South West Butler Quarry LLC; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Warren W  Harshman et al → Plant 3 South West Butler Quarry LLC; 1993-05-01 to 2017-04-26; source msha-controller-operator-history
- **controller_controls_operator:** Warren W  Harshman et al → South West Butler Quarry L L C; 1993-05-01 to 2017-04-26; source msha-controller-operator-history
- **controller_controls_mine:** DRB Construction LLC et al → Plant 3 South West Butler Quarry LLC; 2017-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** DRB Construction LLC et al → South West Butler Quarry L L C; 2017-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harshman Construction LLC et al → South West Butler Quarry L L C; 2017-04-27 to current/open; source msha-controller-operator-history