# Relationship history for MSHA mine 3401935

Current hierarchy: **Martin Marietta Materials Inc → Meridian Aggregates Company, A Limited Partnership → Sawyer - West**

- 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 → Sawyer - West; 2001-04-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Choctaw Materials LLC → Sawyer - West; 2004-05-05 to 2010-06-17; source msha-controller-operator-history
- **controller_controls_mine:** William A  Skeith  et al → Sawyer - West; 2004-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William A  Skeith  et al → Choctaw Materials LLC; 2004-05-05 to 2010-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Hank  Farrell  et al → Choctaw Materials LLC; 2004-05-05 to 2010-06-17; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company, A Limited Partnership → Sawyer - West; 2010-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Meridian Aggregates Company, A Limited Partnership; 2010-06-18 to current/open; source msha-controller-operator-history