# Relationship history for MSHA mine 4605141

Current hierarchy: **Cannon Herbert S & Company Limited → Brent Coal Company Inc → No 1 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:** Cannon Herbert S & Company Limited → No 1 Mine; 1974-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Belcher Dewane → No 1 Mine; 1975-02-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bock Coal Company → No 1 Mine; 1976-04-19 to 1977-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Belcher Dewane → Bock Coal Company; 1976-04-19 to 1977-06-09; source msha-controller-operator-history
- **operator_operates_mine:** Philpott Inc → No 1 Mine; 1977-06-10 to 1978-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Philpott Edward Leigh → No 1 Mine; 1977-06-10 to 1978-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Philpott Edward Leigh → Philpott Inc; 1977-06-10 to 1978-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Brent Coal Company Inc → No 1 Mine; 1978-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cannon Herbert S & Company Limited → Brent Coal Company Inc; 1978-08-01 to current/open; source msha-controller-operator-history