# Relationship history for MSHA mine 1200426

Current hierarchy: **Carmeuse Holding SA → Carmeuse Lime and Stone, Inc. → Buffington 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Marblehead Lime Company → Buffington Plant; 1950-01-01 to 1994-05-08; source msha-controller-operator-history
- **controller_controls_mine:** General Dynamics Corp → Buffington Plant; 1950-01-01 to 1994-05-08; source msha-controller-operator-history
- **controller_controls_operator:** General Dynamics Corp → Marblehead Lime Company; 1950-01-01 to 1994-05-08; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → Buffington Plant; 1994-05-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Marblehead Lime Company → Buffington Plant; 1994-05-09 to 2000-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Marblehead Lime Company; 1994-05-09 to 2000-02-14; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → Buffington Plant; 1997-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Marblehead Lime Company → Buffington Plant; 2000-02-15 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge SA → Buffington Plant; 2000-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge SA → Marblehead Lime Company; 2000-02-15 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Marblehead Lime Company; 2000-02-15 to 2001-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Carmeuse Lime Inc → Buffington Plant; 2002-01-01 to 2010-10-13; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Carmeuse Lime Inc; 2002-01-01 to 2010-10-13; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → Buffington Plant; 2002-06-20 to 2015-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Carmeuse Lime and Stone, Inc. → Buffington Plant; 2010-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Carmeuse Lime and Stone, Inc.; 2010-10-14 to 2015-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge SA → Carmeuse Lime and Stone, Inc.; 2010-10-14 to 2015-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → Buffington Plant; 2015-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Carmeuse Lime and Stone, Inc.; 2015-07-15 to current/open; source msha-controller-operator-history