# Relationship history for MSHA mine 4800018

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials → Granite Canyon 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Martin Marietta Materials Inc → Granite Canyon Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Morrison-Knudsen Company Inc → Granite Canyon Quarry; 1950-01-01 to 1987-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Morrison Knudsen Corp (Old) → Granite Canyon Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morrison Knudsen Corp (Old) → Morrison-Knudsen Company Inc; 1950-01-01 to 1987-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Burlington Resources Inc → Granite Canyon Quarry; 1981-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company → Granite Canyon Quarry; 1987-11-30 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Burlington Resources Inc → Meridian Aggregates Company; 1987-11-30 to 1991-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company → Granite Canyon Quarry; 1991-03-01 to 2001-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Kiewit Mining Group Inc & Mac Acquisitions L P → Granite Canyon Quarry; 1991-03-01 to 2001-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Kiewit Mining Group Inc & Mac Acquisitions L P → Meridian Aggregates Company; 1991-03-01 to 2001-04-09; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Granite Company → Granite Canyon Quarry; 2001-04-10 to 2017-09-10; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Granite Canyon Quarry; 2001-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Meridian Granite Company; 2001-04-10 to 2017-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials → Granite Canyon Quarry; 2017-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials; 2017-09-11 to current/open; source msha-controller-operator-history