# Relationship history for MSHA mine 4001983

Current hierarchy: **Little Gary L & Associates → Gary L Little & Associates → No 1 Strip**

- 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:** Ramsey Billy R → No 1 Strip; 1975-05-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ramsey Trucking Company → No 1 Strip; 1975-12-01 to 1976-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Ramsey Billy R → Ramsey Trucking Company; 1975-12-01 to 1976-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Little Gary L & Associates → No 1 Strip; 1976-02-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gary L Little & Associates → No 1 Strip; 1976-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Little Gary L & Associates → Gary L Little & Associates; 1976-06-15 to current/open; source msha-controller-operator-history