# Relationship history for MSHA mine 2200654

Current hierarchy: **Walker Sue → Walker Sand & Gravel → MIZE 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Pitt Construction Company Inc Of Mississippi → MIZE PIT; 1993-12-01 to 1995-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Pitts Billy D → MIZE PIT; 1993-12-01 to 1995-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Pitts Billy D → Pitt Construction Company Inc Of Mississippi; 1993-12-01 to 1995-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Walker Sue → MIZE PIT; 1994-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Walker Sand & Gravel → MIZE PIT; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walker Sue → Walker Sand & Gravel; 1995-05-01 to current/open; source msha-controller-operator-history