# Relationship history for MSHA mine 0801268

Current hierarchy: **Ready Mix USA Inc → Couch Ready Mix USA → Barth Pit**

- 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:** Ashland Inc → Barth Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** C R  Campbell Sr et al → Barth Pit; 1990-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sand & Dirt Inc → Barth Pit; 1998-10-01 to 1999-12-31; source msha-controller-operator-history
- **controller_controls_operator:** C R  Campbell Sr et al → Sand & Dirt Inc; 1998-10-01 to 1999-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Apac Alabama Inc → Barth Pit; 2000-01-01 to 2000-09-17; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Apac Alabama Inc; 2000-01-01 to 2000-09-17; source msha-controller-operator-history
- **operator_operates_mine:** Ready Mix USA,INC dba Couch Ready Mix USA → Barth Pit; 2000-09-18 to 2000-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Ready Mix USA Inc → Barth Pit; 2000-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ready Mix USA Inc → Ready Mix USA,INC dba Couch Ready Mix USA; 2000-09-18 to 2000-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Couch Ready Mix USA → Barth Pit; 2000-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ready Mix USA Inc → Barth Pit; 2000-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ready Mix USA Inc → Couch Ready Mix USA; 2000-10-01 to current/open; source msha-controller-operator-history