# Relationship history for MSHA mine 4003391

Current hierarchy: **Chadwick  Smith → TMC River Operations Inc. → Linden Quarry**

- 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:** Charles R  Smith → Linden Quarry; 2008-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tennessee Materials Corp. → Linden Quarry; 2010-12-01 to 2013-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Charles R  Smith → Tennessee Materials Corp.; 2010-12-01 to 2013-01-17; source msha-controller-operator-history
- **operator_operates_mine:** TMC River Operations Inc. → Linden Quarry; 2013-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chadwick  Smith → Linden Quarry; 2013-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chadwick  Smith → TMC River Operations Inc.; 2013-01-18 to current/open; source msha-controller-operator-history