# Relationship history for MSHA mine 3401651

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Snyder**

- 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 → Snyder; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burlington Resources Inc → Snyder; 1988-02-01 to 1990-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Materials → Snyder; 1988-07-01 to 1989-07-27; source msha-controller-operator-history
- **controller_controls_mine:** Robert C  Thomson → Snyder; 1988-07-01 to 1993-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Thomson → Aggregate Materials; 1988-07-01 to 1989-07-27; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Gold Company → Snyder; 1989-07-28 to 1989-08-21; source msha-controller-operator-history
- **controller_controls_operator:** Burlington Resources Inc → Meridian Gold Company; 1989-07-28 to 1989-08-21; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Materials → Snyder; 1989-08-22 to 1993-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Thomson → Aggregate Materials; 1989-08-22 to 1993-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Meridian Aggregates Company LP → Snyder; 1991-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company → Snyder; 1993-01-05 to 2001-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Meridian Aggregates Company LP → Meridian Aggregates Company; 1993-01-05 to 2001-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company LP → Snyder; 2001-04-03 to 2006-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Snyder; 2001-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Meridian Aggregates Company LP; 2001-04-03 to 2006-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Snyder; 2006-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2006-07-17 to current/open; source msha-controller-operator-history