# Relationship history for MSHA mine 1300814

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Reasnor Sand**

- 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 → Reasnor Sand; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc et al → Reasnor Sand; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Van Dusseldorp Sand & Gravel Inc → Reasnor Sand; 1950-01-01 to 1991-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Eben  Van Dusseldorp → Reasnor Sand; 1950-01-01 to 1991-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Eben  Van Dusseldorp → Van Dusseldorp Sand & Gravel Inc; 1950-01-01 to 1991-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Kaser Corp → Reasnor Sand; 1991-09-01 to 1997-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc et al → Kaser Corp; 1991-09-01 to 1997-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Kaser Corporation et al → Kaser Corp; 1991-09-01 to 1997-09-04; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates Of Southern Iowa Inc → Reasnor Sand; 1997-09-05 to 2006-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Reasnor Sand; 1997-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates Of Southern Iowa Inc; 1997-09-05 to 2006-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Reasnor Sand; 2006-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2006-07-13 to current/open; source msha-controller-operator-history