# Relationship history for MSHA mine 2700520

Current hierarchy: **Lindsay  Donovan; Gary  Alcock → PINE RIVER SAND AND GRAVEL, LLC → PINE RIVER SAND AND GRAVEL**

- 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

- **operator_operates_mine:** Pine River Sand and Gravel, LLC → PINE RIVER SAND AND GRAVEL; 2020-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lindsay  Donovan et al → PINE RIVER SAND AND GRAVEL; 2020-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lindsay  Donovan et al → Pine River Sand and Gravel, LLC; 2020-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Alcock et al → Pine River Sand and Gravel, LLC; 2020-07-20 to current/open; source msha-controller-operator-history