# Relationship history for MSHA mine 1515863

Current hierarchy: **Lyon Phillip & James Slone → Lyon & Slone Inc → #4**

- 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:** Lyon & Slone Inc → #4; 1986-12-01 to 1987-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Lyon Southwell → #4; 1986-12-01 to 1987-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Lyon Southwell → Lyon & Slone Inc; 1986-12-01 to 1987-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Lyon & Slone Inc → #4; 1987-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lyon Phillip & James Slone → #4; 1987-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lyon Phillip & James Slone → Lyon & Slone Inc; 1987-05-19 to current/open; source msha-controller-operator-history