# Relationship history for MSHA mine 1508692

Current hierarchy: **Rose Alvin R & Sammie D → Triple M & K 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

- **controller_controls_mine:** Jones Jackie--Leith Stewart Et Al → No 1 Mine; 1975-07-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & J Coal Company → No 1 Mine; 1975-08-01 to 1976-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Jones Jackie--Leith Stewart Et Al → S & J Coal Company; 1975-08-01 to 1976-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Triple M & K Coal Company → No 1 Mine; 1976-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rose Alvin R & Sammie D → No 1 Mine; 1976-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rose Alvin R & Sammie D → Triple M & K Coal Company; 1976-05-18 to current/open; source msha-controller-operator-history