# Relationship history for MSHA mine 4601563

Current hierarchy: **Greer Industries Inc → Greer Industries Inc → Cheat River Limestone Company**

- 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

- **controller_controls_mine:** Martin Marietta Materials Inc → Cheat River Limestone Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Greer Industries Inc → Cheat River Limestone Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Manheim Stone Inc → Cheat River Limestone Company; 1950-01-01 to 1978-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Manheim Stone Inc → Cheat River Limestone Company; 1950-01-01 to 1978-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Manheim Stone Inc → Manheim Stone Inc; 1950-01-01 to 1978-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Greenbrier Aggregates Inc → Cheat River Limestone Company; 1978-05-01 to 1998-08-24; source msha-controller-operator-history
- **controller_controls_mine:** C Robert  Harman  et al → Cheat River Limestone Company; 1978-05-01 to 1998-08-24; source msha-controller-operator-history
- **controller_controls_operator:** C Robert  Harman  et al → Greenbrier Aggregates Inc; 1978-05-01 to 1998-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → Cheat River Limestone Company; 1998-08-26 to 2005-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1998-08-26 to 2005-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Cheat River Limestone Company; 2005-05-19 to 2006-12-17; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2005-05-19 to 2006-12-17; source msha-controller-operator-history
- **operator_operates_mine:** Greer Industries Inc → Cheat River Limestone Company; 2006-12-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greer Industries Inc → Greer Industries Inc; 2006-12-18 to current/open; source msha-controller-operator-history