# Relationship history for MSHA mine 2200657

Current hierarchy: **Lack James H → Blakeney Creek Sand & Gravel → LACK PIT**

- 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:** Walker Sand & Gravel → LACK PIT; 1994-04-01 to 1998-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Walker Sue → LACK PIT; 1994-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walker Sue → Walker Sand & Gravel; 1994-04-01 to 1998-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Blakeney Creek Sand & Gravel → LACK PIT; 1998-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lack James H → LACK PIT; 1998-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lack James H → Blakeney Creek Sand & Gravel; 1998-05-06 to current/open; source msha-controller-operator-history