# Relationship history for MSHA mine 0102196

Current hierarchy: **Ready Mix USA Inc → Couch Ready Mix USA → CHATTAHOOCHEE 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

- **operator_operates_mine:** Couch Construction L P → CHATTAHOOCHEE PIT; 1980-02-01 to 2000-09-17; source msha-controller-operator-history
- **controller_controls_mine:** Superfos America Inc → CHATTAHOOCHEE PIT; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Superfos America Inc → Couch Construction L P; 1980-02-01 to 2000-09-17; source msha-controller-operator-history
- **operator_operates_mine:** Couch Ready Mix USA → CHATTAHOOCHEE PIT; 2000-09-18 to 2000-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Ready Mix USA Inc → CHATTAHOOCHEE PIT; 2000-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ready Mix USA Inc → Couch Ready Mix USA; 2000-09-18 to 2000-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Couch Ready Mix USA → CHATTAHOOCHEE PIT; 2000-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ready Mix USA Inc → CHATTAHOOCHEE 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