# Relationship history for MSHA mine 1517072

Current hierarchy: **Vanderpool A Dee-Gary B Lay → Maranda Coal Company → No 1 Mine**

- 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:** Rsf Coal Company → No 1 Mine; 1991-04-01 to 1991-10-29; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Tommy Et Al → No 1 Mine; 1991-04-01 to 1991-10-29; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Tommy Et Al → Rsf Coal Company; 1991-04-01 to 1991-10-29; source msha-controller-operator-history
- **operator_operates_mine:** Peak Mountain Coal Company → No 1 Mine; 1991-10-30 to 1992-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Drinnon Nathan Et Al → No 1 Mine; 1991-10-30 to 1992-06-10; source msha-controller-operator-history
- **controller_controls_operator:** Drinnon Nathan Et Al → Peak Mountain Coal Company; 1991-10-30 to 1992-06-10; source msha-controller-operator-history
- **operator_operates_mine:** Maranda Coal Company → No 1 Mine; 1992-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vanderpool A Dee-Gary B Lay Et Al → No 1 Mine; 1992-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vanderpool A Dee-Gary B Lay Et Al → Maranda Coal Company; 1992-06-11 to current/open; source msha-controller-operator-history