# Relationship history for MSHA mine 1513656

Current hierarchy: **Fox David L → L & B Coal Company 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:** Claxon Lewis → No 1 Surface Mine; 1978-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L & B Coal Company Inc → No 1 Surface Mine; 1982-08-01 to 1988-04-12; source msha-controller-operator-history
- **controller_controls_operator:** Claxon Lewis → L & B Coal Company Inc; 1982-08-01 to 1988-04-12; source msha-controller-operator-history
- **operator_operates_mine:** L & B Coal Company Inc → No 1 Surface Mine; 1988-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fox David L → No 1 Surface Mine; 1988-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fox David L → L & B Coal Company Inc; 1988-04-13 to current/open; source msha-controller-operator-history