# Relationship history for MSHA mine 1515559

Current hierarchy: **Bundy Ron → R & B Coal Tipple → No 1 Tipple**

- 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:** R & B Coal Tipple → No 1 Tipple; 1986-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bundy Ron Et Al → No 1 Tipple; 1986-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bundy Ron Et Al → R & B Coal Tipple; 1986-03-01 to current/open; source msha-controller-operator-history