# Relationship history for MSHA mine 4400049

Current hierarchy: **Carmeuse Holding SA → O-N Minerals (Chemstone Company) → Middletown Quarry**

- 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:** Flintkote Stone Products Company → Middletown Quarry; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Flintkote Company → Middletown Quarry; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Flintkote Company → Flintkote Stone Products Company; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Cimenteries Cbr Cementbedrijven → Middletown Quarry; 1980-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Genstar Stone Products Company → Middletown Quarry; 1980-04-07 to 1986-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Cimenteries Cbr Cementbedrijven → Genstar Stone Products Company; 1980-04-07 to 1986-11-03; source msha-controller-operator-history
- **operator_operates_mine:** Redland Genstar Inc → Middletown Quarry; 1986-11-04 to 1996-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → Middletown Quarry; 1986-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Redland Genstar Inc; 1986-11-04 to 1996-08-28; source msha-controller-operator-history
- **operator_operates_mine:** Global Stone Chemstone Corp → Middletown Quarry; 1996-08-29 to 1998-06-21; source msha-controller-operator-history
- **controller_controls_mine:** Global Stone Corp → Middletown Quarry; 1996-08-29 to 1998-06-21; source msha-controller-operator-history
- **controller_controls_operator:** Global Stone Corp → Global Stone Chemstone Corp; 1996-08-29 to 1998-06-21; source msha-controller-operator-history
- **operator_operates_mine:** O-N Minerals (Chemstone Company) → Middletown Quarry; 1998-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oglebay Norton Company → Middletown Quarry; 1998-06-22 to 2008-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Oglebay Norton Company → O-N Minerals (Chemstone Company); 1998-06-22 to 2008-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → Middletown Quarry; 2008-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → O-N Minerals (Chemstone Company); 2008-02-13 to current/open; source msha-controller-operator-history