# Relationship history for MSHA mine 3401800

Current hierarchy: **Mark S  Ibison → Ibison Stone Sales → Ibison Stone Sales**

- 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:** Jimmy  Autrey  et al → Ibison Stone Sales; 1990-06-01 to 1999-01-24; source msha-controller-operator-history
- **operator_operates_mine:** Autrey Stone Company → Ibison Stone Sales; 1997-07-01 to 1999-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy  Autrey  et al → Autrey Stone Company; 1997-07-01 to 1999-01-24; source msha-controller-operator-history
- **operator_operates_mine:** Ibison Stone Sales → Ibison Stone Sales; 1999-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark S  Ibison → Ibison Stone Sales; 1999-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark S  Ibison → Ibison Stone Sales; 1999-01-25 to current/open; source msha-controller-operator-history