# Relationship history for MSHA mine 4400082

Current hierarchy: **Lhoist Group → Lhoist North America of Virginia, Inc. → KIMBALLTON PLANT #1**

- 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

- **controller_controls_mine:** USG Corporation → KIMBALLTON PLANT #1; 1950-01-01 to 1988-02-23; source msha-controller-operator-history
- **operator_operates_mine:** Gold Bond Building Products → KIMBALLTON PLANT #1; 1950-01-01 to 1984-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → KIMBALLTON PLANT #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Gold Bond Building Products; 1950-01-01 to 1984-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Apg Lime Corp → KIMBALLTON PLANT #1; 1984-02-28 to 1988-02-23; source msha-controller-operator-history
- **controller_controls_operator:** USG Corporation → Apg Lime Corp; 1984-02-28 to 1988-02-23; source msha-controller-operator-history
- **operator_operates_mine:** Apg Lime Corp → KIMBALLTON PLANT #1; 1988-02-24 to 1998-06-30; source msha-controller-operator-history
- **controller_controls_mine:** A P Green Industries Inc → KIMBALLTON PLANT #1; 1988-02-24 to 1998-06-30; source msha-controller-operator-history
- **controller_controls_operator:** A P Green Industries Inc → Apg Lime Corp; 1988-02-24 to 1998-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Apg Lime Corp → KIMBALLTON PLANT #1; 1998-07-01 to 1999-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Global Industrial Technologies Inc → KIMBALLTON PLANT #1; 1998-07-01 to 1999-05-03; source msha-controller-operator-history
- **controller_controls_operator:** Global Industrial Technologies Inc → Apg Lime Corp; 1998-07-01 to 1999-05-03; source msha-controller-operator-history
- **operator_operates_mine:** Lhoist North America of Virginia, Inc. → KIMBALLTON PLANT #1; 1999-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lhoist Group → KIMBALLTON PLANT #1; 1999-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lhoist Group → Lhoist North America of Virginia, Inc.; 1999-05-04 to current/open; source msha-controller-operator-history