# Relationship history for MSHA mine 3401299

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta  Materials, Inc. → Davis 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 → Davis Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Material Producers Inc → Davis Quarry; 1980-11-01 to 1987-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Alonzo Aloysius(Bud)  Vance → Davis Quarry; 1980-11-01 to 1987-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Alonzo Aloysius(Bud)  Vance → Material Producers Inc; 1980-11-01 to 1987-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Material Producers Inc → Davis Quarry; 1987-08-18 to 2001-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Lohne → Davis Quarry; 1987-08-18 to 2001-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Lohne → Material Producers Inc; 1987-08-18 to 2001-06-03; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates-Southwest Division → Davis Quarry; 2001-06-04 to 2005-12-12; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates-Southwest Division; 2001-06-04 to 2005-12-12; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta  Materials, Inc. → Davis Quarry; 2005-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta  Materials, Inc.; 2005-12-13 to current/open; source msha-controller-operator-history