# Relationship history for MSHA mine 3501964

Current hierarchy: **Wheatley George → Fossil Rock Inc → Oak Ranch Pit #1**

- 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

- **operator_operates_mine:** R J Taggart Construction Company Inc → Oak Ranch Pit #1; 1950-01-01 to 1981-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Taggart Robert J → Oak Ranch Pit #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taggart Robert J → R J Taggart Construction Company Inc; 1950-01-01 to 1981-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Fossil Rock Inc → Oak Ranch Pit #1; 1981-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wheatley George → Oak Ranch Pit #1; 1981-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wheatley George → Fossil Rock Inc; 1981-04-30 to current/open; source msha-controller-operator-history