# Relationship history for MSHA mine 1511567

Current hierarchy: **Collingsworth Harold → B C & P Construction → No 1 Surface**

- 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:** Ray Coal Company → No 1 Surface; 1978-09-01 to 1979-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Cornett Raymond → No 1 Surface; 1978-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cornett Raymond → Ray Coal Company; 1978-09-01 to 1979-08-07; source msha-controller-operator-history
- **operator_operates_mine:** B C & P Construction → No 1 Surface; 1979-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Collingsworth Harold Et Al → No 1 Surface; 1979-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collingsworth Harold Et Al → B C & P Construction; 1979-08-08 to current/open; source msha-controller-operator-history