# Relationship history for MSHA mine 1509937

Current hierarchy: **Smallwood Lenard → Lenard Mining Company → #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

- **controller_controls_mine:** Compton Earl → #1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Deluxe Coal Co → #1 Mine; 1976-09-08 to 1978-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Compton Earl → Deluxe Coal Co; 1976-09-08 to 1978-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Lenard Mining Company → #1 Mine; 1978-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smallwood Lenard → #1 Mine; 1978-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smallwood Lenard → Lenard Mining Company; 1978-02-28 to current/open; source msha-controller-operator-history