# Relationship history for MSHA mine 1201577

Current hierarchy: **Fleming Allen L → Adams County Sand & Gravel → Adams County Sand & 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:** Adams County Sand & Gravel → Adams County Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fleming Allen L → Adams County Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fleming Allen L → Adams County Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history