# Relationship history for MSHA mine 0401816

Current hierarchy: **James  Richert → IMPERIAL VALLEY AGGREGATES LLC → EAST HIGHLINE**

- 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:** Gibson's All American Aggregates, Inc. → EAST HIGHLINE; 1950-01-01 to 2019-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Donald H  Gibson → EAST HIGHLINE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald H  Gibson → Gibson's All American Aggregates, Inc.; 1950-01-01 to 2019-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Matt  Richert → EAST HIGHLINE; 2015-04-27 to 2021-04-11; source msha-controller-operator-history
- **operator_operates_mine:** Imperial Valley Aggregates LLC → EAST HIGHLINE; 2019-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matt  Richert → Imperial Valley Aggregates LLC; 2019-03-07 to 2021-04-11; source msha-controller-operator-history
- **controller_controls_mine:** James  Richert → EAST HIGHLINE; 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