# Relationship history for MSHA mine 2401297

Current hierarchy: **H Weslry  Strong → Yellowstone Travertine → Yellowstone Travertine**

- 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:** Gardiner Travertine Company → Yellowstone Travertine; 1950-01-01 to 1978-09-27; source msha-controller-operator-history
- **controller_controls_mine:** Gardiner Travertine Company → Yellowstone Travertine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gardiner Travertine Company → Gardiner Travertine Company; 1950-01-01 to 1978-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Yellowstone Travertine → Yellowstone Travertine; 1978-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** H Weslry  Strong et al → Yellowstone Travertine; 1978-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H Weslry  Strong et al → Yellowstone Travertine; 1978-09-28 to current/open; source msha-controller-operator-history