# Relationship history for MSHA mine 0404770

Current hierarchy: **James  Richert → Imperial Valley Aggregates LLC → Frink**

- 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 → Frink; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ellis Transportation → Frink; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Massey Sand & Rock Company → Frink; 1985-09-01 to 1986-12-26; source msha-controller-operator-history
- **controller_controls_operator:** Ellis Transportation → Massey Sand & Rock Company; 1985-09-01 to 1986-12-26; source msha-controller-operator-history
- **operator_operates_mine:** Tarmac California Inc → Frink; 1986-12-27 to 1992-06-21; source msha-controller-operator-history
- **controller_controls_mine:** Tarmac Plc → Frink; 1986-12-27 to 1992-06-21; source msha-controller-operator-history
- **controller_controls_operator:** Tarmac Plc → Tarmac California Inc; 1986-12-27 to 1992-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Granite Construction Company → Frink; 1992-06-22 to 2021-04-11; source msha-controller-operator-history
- **controller_controls_operator:** Granite Construction Inc → Granite Construction Company; 1992-06-22 to 2021-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Matt  Richert → Frink; 2015-04-27 to 2021-04-11; source msha-controller-operator-history
- **operator_operates_mine:** Imperial Valley Aggregates LLC → Frink; 2021-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James  Richert → Frink; 2021-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Richert → Imperial Valley Aggregates LLC; 2021-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matt  Richert → Imperial Valley Aggregates LLC; 2021-04-12 to 2021-04-11; source msha-controller-operator-history