# Relationship history for MSHA mine 2901434

Current hierarchy: **Calmat Company → Calmat Company Of New Mexico → EDGEWOOD PIT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** New Mexico State Highway Department → EDGEWOOD PIT; 1950-01-01 to 1986-04-29; source msha-controller-operator-history
- **controller_controls_mine:** State Of New Mexico → EDGEWOOD PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** State Of New Mexico → New Mexico State Highway Department; 1950-01-01 to 1986-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Sun & Soil Inc → EDGEWOOD PIT; 1986-04-30 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Huston Donald E → EDGEWOOD PIT; 1986-04-30 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Huston Donald E → Sun & Soil Inc; 1986-04-30 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Calmat Company → EDGEWOOD PIT; 1989-02-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Calmat Company Of New Mexico → EDGEWOOD PIT; 1997-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company → Calmat Company Of New Mexico; 1997-07-01 to current/open; source msha-controller-operator-history