# Relationship history for MSHA mine 4105063

Current hierarchy: **Brett  Strebeck; Robert  Lane; Steve  Wright → Amarillo Road Company L.P. → Ross 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Steve  Wright et al → Ross Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Amarillo Road Company L.P. → Ross Pit; 2014-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Wright et al → Amarillo Road Company L.P.; 2014-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brett  Strebeck  et al → Amarillo Road Company L.P.; 2014-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Lane et al → Amarillo Road Company L.P.; 2014-04-14 to current/open; source msha-controller-operator-history