# Relationship history for MSHA mine 1201671

Current hierarchy: **West Judy-Oliver S Berry → B B & R Construction → B B & R Construction**

- 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:** C M S Coal Company Inc → B B & R Construction; 1978-09-01 to 1980-01-31; source msha-controller-operator-history
- **controller_controls_mine:** West Roger H → B B & R Construction; 1978-09-01 to 1980-01-31; source msha-controller-operator-history
- **controller_controls_operator:** West Roger H → C M S Coal Company Inc; 1978-09-01 to 1980-01-31; source msha-controller-operator-history
- **operator_operates_mine:** C M S Coal Company Inc → B B & R Construction; 1980-02-01 to 1981-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Sanders Ronald → B B & R Construction; 1980-02-01 to 1981-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Sanders Ronald → C M S Coal Company Inc; 1980-02-01 to 1981-01-28; source msha-controller-operator-history
- **operator_operates_mine:** B B & R Construction → B B & R Construction; 1981-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** West Judy-Oliver S Berry Et Al → B B & R Construction; 1981-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** West Judy-Oliver S Berry Et Al → B B & R Construction; 1981-01-29 to current/open; source msha-controller-operator-history