# Relationship history for MSHA mine 1001739

Current hierarchy: **Theo R  Orchard → Idaho Travertine Corp → Fall Creek Travertine Quarry**

- 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:** Dorain Pehrson Construction → Fall Creek Travertine Quarry; 1986-05-01 to 1989-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Pehrson Dorain & Betty → Fall Creek Travertine Quarry; 1986-05-01 to 1989-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Pehrson Dorain & Betty → Dorain Pehrson Construction; 1986-05-01 to 1989-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Idaho Travertine Corp → Fall Creek Travertine Quarry; 1989-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Theo R  Orchard → Fall Creek Travertine Quarry; 1989-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Theo R  Orchard → Idaho Travertine Corp; 1989-05-05 to current/open; source msha-controller-operator-history