# Relationship history for MSHA mine 2001298

Current hierarchy: **Edward C  Levy Jr → BURROUGHS MATERIALS CORP → WALLACE STONE PLANT**

- 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:** Blount Materials Corp → WALLACE STONE PLANT; 1950-01-01 to 1986-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Blount Inc → WALLACE STONE PLANT; 1950-01-01 to 1986-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Blount Inc → Blount Materials Corp; 1950-01-01 to 1986-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Wallace Stone Plant → WALLACE STONE PLANT; 1986-03-01 to 2007-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Edward C  Levy Jr et al → WALLACE STONE PLANT; 1986-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward C  Levy Jr et al → Wallace Stone Plant; 1986-03-01 to 2007-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Edward C  Levy Jr et al → WALLACE STONE PLANT; 1999-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BURROUGHS MATERIALS CORP → WALLACE STONE PLANT; 2007-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward C  Levy Jr et al → BURROUGHS MATERIALS CORP; 2007-05-31 to current/open; source msha-controller-operator-history