# Relationship history for MSHA mine 0404243

Current hierarchy: **Reed Family Companies → 7/11 Materials Inc → 7/11 Materials Inc-Robie Ranch**

- 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:** Reed Family Companies → 7/11 Materials Inc-Robie Ranch; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Teichert Inc → 7/11 Materials Inc-Robie Ranch; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** George Reed Inc → 7/11 Materials Inc-Robie Ranch; 1978-03-09 to 1983-12-07; source msha-controller-operator-history
- **controller_controls_operator:** Reed Family Companies → George Reed Inc; 1978-03-09 to 1983-12-07; source msha-controller-operator-history
- **operator_operates_mine:** Teichert Aggregates → 7/11 Materials Inc-Robie Ranch; 1983-12-08 to 2005-11-06; source msha-controller-operator-history
- **controller_controls_operator:** Teichert Inc → Teichert Aggregates; 1983-12-08 to 2005-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Reed Family Companies → 7/11 Materials Inc-Robie Ranch; 1995-04-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** 7/11 Materials Inc → 7/11 Materials Inc-Robie Ranch; 2005-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reed Family Companies → 7/11 Materials Inc; 2005-11-07 to current/open; source msha-controller-operator-history