# Relationship history for MSHA mine 0404784

Current hierarchy: **Granite Construction Inc → Granite Construction Company → AMMEX**

- 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:** Granite Construction Inc → AMMEX; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clair  Merrill → AMMEX; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Merrill Corp → AMMEX; 1986-01-01 to 1988-07-28; source msha-controller-operator-history
- **controller_controls_operator:** Clair  Merrill → Merrill Corp; 1986-01-01 to 1988-07-28; source msha-controller-operator-history
- **controller_controls_mine:** Tarmac Plc → AMMEX; 1986-12-27 to 1992-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Tarmac California Inc → AMMEX; 1988-07-29 to 1992-06-21; source msha-controller-operator-history
- **controller_controls_operator:** Tarmac Plc → Tarmac California Inc; 1988-07-29 to 1992-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Granite Construction Company → AMMEX; 1992-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Granite Construction Inc → Granite Construction Company; 1992-06-22 to current/open; source msha-controller-operator-history