# Relationship history for MSHA mine 4002981

Current hierarchy: **Michael  Hollingshead → SRM Materials, LLC → SRM Monteagle 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

- **operator_operates_mine:** Sequatchie Concrete Service Inc → SRM Monteagle Quarry; 1988-03-01 to 2020-11-05; source msha-controller-operator-history
- **controller_controls_mine:** Robert R  Thomas Jr et al → SRM Monteagle Quarry; 1988-03-01 to 2019-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Robert R  Thomas Jr et al → Sequatchie Concrete Service Inc; 1988-03-01 to 2019-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Hollingshead et al → SRM Monteagle Quarry; 2013-12-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert R Thomas Jr et al → SRM Monteagle Quarry; 2019-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert R Thomas Jr et al → Sequatchie Concrete Service Inc; 2019-05-06 to 2020-11-05; source msha-controller-operator-history
- **controller_controls_operator:** Jesse  Slaton et al → Sequatchie Concrete Service Inc; 2019-05-06 to 2020-11-05; source msha-controller-operator-history
- **controller_controls_operator:** David  Thomas et al → Sequatchie Concrete Service Inc; 2019-05-06 to 2020-11-05; source msha-controller-operator-history
- **operator_operates_mine:** SRM Materials, LLC → SRM Monteagle Quarry; 2020-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Hollingshead et al → SRM Materials, LLC; 2020-11-06 to current/open; source msha-controller-operator-history