# Relationship history for MSHA mine 3501965

Current hierarchy: **Mc Clean David T → Mc Clean Logging & Construction Company Inc → Oak Ranch 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Mobile Crushing Company → Oak Ranch Pit; 1950-01-01 to 1980-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Lonny  Bessett → Oak Ranch Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lonny  Bessett → Mobile Crushing Company; 1950-01-01 to 1980-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Mc Clean David T → Oak Ranch Pit; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mc Clean Logging & Construction Company Inc → Oak Ranch Pit; 1980-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Clean David T → Mc Clean Logging & Construction Company Inc; 1980-04-02 to current/open; source msha-controller-operator-history