# Relationship history for MSHA mine 3401555

Current hierarchy: **Rick D  Bumpers → Stigler Stone Company Inc → Barbee Quarry**

- 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:** Stigler Stone Company → Barbee Quarry; 1986-04-01 to 1987-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Don  Sebourn → Barbee Quarry; 1986-04-01 to 1987-06-07; source msha-controller-operator-history
- **controller_controls_operator:** Don  Sebourn → Stigler Stone Company; 1986-04-01 to 1987-06-07; source msha-controller-operator-history
- **operator_operates_mine:** Stigler Stone Company Inc → Barbee Quarry; 1987-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rick D  Bumpers → Barbee Quarry; 1987-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick D  Bumpers → Stigler Stone Company Inc; 1987-06-08 to current/open; source msha-controller-operator-history