# Relationship history for MSHA mine 2301883

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Kansas City, LLC → Parkville 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 → Parkville Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Park Bend Company → Parkville Quarry; 1983-06-01 to 1989-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Paul L  Roberts → Parkville Quarry; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul L  Roberts → Park Bend Company; 1983-06-01 to 1989-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Parkville Stone Company → Parkville Quarry; 1989-09-01 to 2001-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Louis A  Griesemer et al → Parkville Quarry; 1989-09-01 to 2001-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Louis A  Griesemer et al → Parkville Stone Company; 1989-09-01 to 2001-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → Parkville Quarry; 2001-01-02 to 2005-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 2001-01-02 to 2005-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Kansas City, LLC → Parkville Quarry; 2005-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc et al → Parkville Quarry; 2005-02-01 to 2014-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc et al → Martin Marietta Kansas City, LLC; 2005-02-01 to 2014-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Hunt Midwest Enterprises et al → Martin Marietta Kansas City, LLC; 2005-02-01 to 2014-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Parkville Quarry; 2014-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Kansas City, LLC; 2014-04-03 to current/open; source msha-controller-operator-history