# Relationship history for MSHA mine 0402773

Current hierarchy: **Taylor Melvin L-Faron & Todd → M F T Sand & Gravel Company → M F T Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Carl Pacheco Sand & Gravel Company → M F T Sand & Gravel; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Pacheco Carl Sand & Gravel Company → M F T Sand & Gravel; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Pacheco Carl Sand & Gravel Company → Carl Pacheco Sand & Gravel Company; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **operator_operates_mine:** M F T Sand & Gravel Company → M F T Sand & Gravel; 1979-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Taylor Melvin L-Faron & Todd → M F T Sand & Gravel; 1979-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Melvin L-Faron & Todd → M F T Sand & Gravel Company; 1979-04-01 to current/open; source msha-controller-operator-history