# Relationship history for MSHA mine 1401805

Current hierarchy: **Harshman Construction LLC; DRB Construction LLC → South West Butler Quarry LLC → Plant 8**

- 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

- **controller_controls_mine:** Warren W  Harshman et al → Plant 8; 1993-05-01 to 2017-04-26; source msha-controller-operator-history
- **controller_controls_mine:** DRB Construction LLC et al → Plant 8; 2017-04-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** South West Butler Quarry LLC → Plant 8; 2019-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** DRB Construction LLC et al → South West Butler Quarry LLC; 2019-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harshman Construction LLC et al → South West Butler Quarry LLC; 2019-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warren W  Harshman et al → South West Butler Quarry LLC; 2019-09-04 to 2017-04-26; source msha-controller-operator-history