# Relationship history for MSHA mine 4104991

Current hierarchy: **Johnny J  Massengale → Johnny's Dozer Service, LLC → Massengale 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** John R  Thompson → Massengale Quarry; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J.R. THOMPSON, INC. → Massengale Quarry; 2012-12-19 to 2016-06-19; source msha-controller-operator-history
- **controller_controls_operator:** John R  Thompson → J.R. THOMPSON, INC.; 2012-12-19 to 2016-06-19; source msha-controller-operator-history
- **operator_operates_mine:** Johnny's Dozer Service, LLC → Massengale Quarry; 2016-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnny J  Massengale → Massengale Quarry; 2016-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnny J  Massengale → Johnny's Dozer Service, LLC; 2016-06-20 to current/open; source msha-controller-operator-history