# Relationship history for MSHA mine 3401502

Current hierarchy: **Henry  Comer → Comer Mining Company Inc → COMER NO. 1**

- 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:** B & R Stone → COMER NO. 1; 1985-07-01 to 2000-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Beede Sam Et Al → COMER NO. 1; 1985-07-01 to 2000-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Beede Sam Et Al → B & R Stone; 1985-07-01 to 2000-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Comer Mining Company Inc → COMER NO. 1; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Henry  Comer → COMER NO. 1; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry  Comer → Comer Mining Company Inc; 2000-09-01 to current/open; source msha-controller-operator-history