# Relationship history for MSHA mine 2301861

Current hierarchy: **Betty L  Harper → Doss & Harper Stone Company → Doss & Harper Stone**

- 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:** Betty L  Harper → Doss & Harper Stone; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Inman Sand & Gravel Company → Doss & Harper Stone; 1981-07-01 to 1984-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Inman Sand & Gravel Company → Doss & Harper Stone; 1981-07-01 to 1984-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Inman Sand & Gravel Company → Inman Sand & Gravel Company; 1981-07-01 to 1984-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Doss & Harper Stone Company → Doss & Harper Stone; 1984-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Betty L  Harper → Doss & Harper Stone Company; 1984-06-01 to current/open; source msha-controller-operator-history