# Relationship history for MSHA mine 2002498

Current hierarchy: **Barrett Paving Materials Inc & Whittaker & Gooding → Whittaker & Gooding Company → Washtenaw County 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:** Whittaker & Gooding Company → Washtenaw County Pit; 1950-01-01 to 1981-06-25; source msha-controller-operator-history
- **operator_operates_mine:** Whittaker & Gooding Company → Washtenaw County Pit; 1979-01-01 to 1981-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Whittaker & Gooding Company → Whittaker & Gooding Company; 1979-01-01 to 1981-06-25; source msha-controller-operator-history
- **operator_operates_mine:** Whittaker & Gooding Company → Washtenaw County Pit; 1981-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barrett Paving Materials Inc & Whittaker & Gooding → Washtenaw County Pit; 1981-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barrett Paving Materials Inc & Whittaker & Gooding → Whittaker & Gooding Company; 1981-06-26 to current/open; source msha-controller-operator-history