# Relationship history for MSHA mine 2300689

Current hierarchy: **Kirk  Manier → Big Piney Sand LLC → M Manier 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:** Big Piney Enterprises Ltd Inc → M Manier Sand & Gravel; 1950-01-01 to 2020-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Michael S  Manier → M Manier Sand & Gravel; 1950-01-01 to 2014-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Michael S  Manier → Big Piney Enterprises Ltd Inc; 1950-01-01 to 2014-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Kirk  Manier et al → M Manier Sand & Gravel; 2014-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kirk  Manier et al → Big Piney Enterprises Ltd Inc; 2014-12-02 to 2020-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Sandra  Manier et al → Big Piney Enterprises Ltd Inc; 2014-12-02 to 2020-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Big Piney Sand LLC → M Manier Sand & Gravel; 2020-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kirk  Manier → M Manier Sand & Gravel; 2020-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kirk  Manier → Big Piney Sand LLC; 2020-02-01 to current/open; source msha-controller-operator-history