# Relationship history for MSHA mine 4601371

Current hierarchy: **Reading & Bates Corp → Belva Coal Company Inc → No 4-B**

- 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:** Belva Coal Company Inc → No 4-B; 1950-01-01 to 1976-09-26; source msha-controller-operator-history
- **controller_controls_mine:** Impco-International Mining & Petroleum Co → No 4-B; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Impco-International Mining & Petroleum Co → Belva Coal Company Inc; 1950-01-01 to 1976-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Virginia Coals → No 4-B; 1976-09-27 to 1976-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Wright Larry → No 4-B; 1976-09-27 to 1976-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Wright Larry → Virginia Coals; 1976-09-27 to 1976-12-31; source msha-controller-operator-history
- **operator_operates_mine:** B & R Coal Mining Company Inc → No 4-B; 1977-01-01 to 1978-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Sparks Charles L → No 4-B; 1977-01-01 to 1978-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Sparks Charles L → B & R Coal Mining Company Inc; 1977-01-01 to 1978-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Reading & Bates Corp → No 4-B; 1977-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Belva Coal Company Inc → No 4-B; 1978-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reading & Bates Corp → Belva Coal Company Inc; 1978-04-18 to current/open; source msha-controller-operator-history