# Relationship history for MSHA mine 1506223

Current hierarchy: **Collins Jimmy & John Sexton → L & L Coal Company → No 2**

- 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:** L & L Coal Company → No 2; 1950-01-01 to 1979-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Sexton Landon & Lenville → No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sexton Landon & Lenville → L & L Coal Company; 1950-01-01 to 1979-07-24; source msha-controller-operator-history
- **operator_operates_mine:** L & L Coal Company → No 2; 1979-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Collins Jimmy & John Sexton → No 2; 1979-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collins Jimmy & John Sexton → L & L Coal Company; 1979-07-25 to current/open; source msha-controller-operator-history