# Relationship history for MSHA mine 1511230

Current hierarchy: **Wood Jarrett M Jr → W-2 Inc → No 1 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

- **controller_controls_mine:** Wood Jarrett M Jr → No 1 Surface Mine; 1974-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Greer Elmo → No 1 Surface Mine; 1978-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W-2 Inc → No 1 Surface Mine; 1978-04-01 to 1978-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Wood Jarrett M Jr → W-2 Inc; 1978-04-01 to 1978-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Elmo Greer & Associates → No 1 Surface Mine; 1978-06-07 to 1978-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Greer Elmo → Elmo Greer & Associates; 1978-06-07 to 1978-06-08; source msha-controller-operator-history
- **operator_operates_mine:** W-2 Inc → No 1 Surface Mine; 1978-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wood Jarrett M Jr → W-2 Inc; 1978-06-09 to current/open; source msha-controller-operator-history