# Relationship history for MSHA mine 4406955

Current hierarchy: **Delmer S  Vencill → Vencill Corp → Vencill #9**

- 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:** Delmer S  Vencill → Vencill #9; 1987-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Solid Rock Llc → Vencill #9; 1999-05-01 to 2000-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Henry T  McDaniel et al → Vencill #9; 1999-05-01 to 2000-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Henry T  McDaniel et al → Solid Rock Llc; 1999-05-01 to 2000-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Vencill Corp → Vencill #9; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Delmer S  Vencill → Vencill Corp; 2000-05-01 to current/open; source msha-controller-operator-history