# Relationship history for MSHA mine 1505415

Current hierarchy: **Nick A  Cooley → L & T Mining Inc → No 5 Surface 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

- **operator_operates_mine:** Yankee Clipper Mining Company Inc → No 5 Surface Mine; 1950-01-01 to 1976-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Yankee Clipper Mining Company Inc → No 5 Surface Mine; 1950-01-01 to 1976-10-20; source msha-controller-operator-history
- **controller_controls_operator:** Yankee Clipper Mining Company Inc → Yankee Clipper Mining Company Inc; 1950-01-01 to 1976-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Taylor Thomas L → No 5 Surface Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L & T Mining Inc → No 5 Surface Mine; 1976-10-21 to 1991-09-12; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Thomas L → L & T Mining Inc; 1976-10-21 to 1991-09-12; source msha-controller-operator-history
- **operator_operates_mine:** L & T Mining Inc → No 5 Surface Mine; 1991-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nick A  Cooley et al → No 5 Surface Mine; 1991-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick A  Cooley et al → L & T Mining Inc; 1991-09-13 to current/open; source msha-controller-operator-history