# Relationship history for MSHA mine 1511280

Current hierarchy: **Lester Robert-Charles Robert Stump-Bobby Blankensh → L S B Coal Company → No 3 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:** Lester Robert-Charles Robert Stump-Bobby Blankensh → No 3 Mine; 1977-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L S B Coal Company → No 3 Mine; 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lester Robert-Charles Robert Stump-Bobby Blankensh → L S B Coal Company; 1978-05-01 to current/open; source msha-controller-operator-history