# Relationship history for MSHA mine 1511776

Current hierarchy: **Clark Colin C → April Coal Company Inc → Mine 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

- **controller_controls_mine:** Cardinal Resources Inc → Mine No 1; 1978-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cardinal Resources Inc → Mine No 1; 1979-05-01 to 1979-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Cardinal Resources Inc → Cardinal Resources Inc; 1979-05-01 to 1979-06-19; source msha-controller-operator-history
- **operator_operates_mine:** N & N Coal Company → Mine No 1; 1979-06-20 to 1980-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Napier Arthur & Jimmy → Mine No 1; 1979-06-20 to 1980-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Napier Arthur & Jimmy → N & N Coal Company; 1979-06-20 to 1980-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Apacoy Mining Inc → Mine No 1; 1980-05-13 to 1981-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Dale Carroll → Mine No 1; 1980-05-13 to 1981-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Dale Carroll → Apacoy Mining Inc; 1980-05-13 to 1981-01-04; source msha-controller-operator-history
- **operator_operates_mine:** Cardinal Resources Inc → Mine No 1; 1981-01-05 to 1981-04-26; source msha-controller-operator-history
- **controller_controls_operator:** Cardinal Resources Inc → Cardinal Resources Inc; 1981-01-05 to 1981-04-26; source msha-controller-operator-history
- **operator_operates_mine:** London Resources Inc → Mine No 1; 1981-04-27 to 1981-08-09; source msha-controller-operator-history
- **controller_controls_mine:** Justice Clarence → Mine No 1; 1981-04-27 to 1981-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Justice Clarence → London Resources Inc; 1981-04-27 to 1981-08-09; source msha-controller-operator-history
- **operator_operates_mine:** April Coal Company Inc → Mine No 1; 1981-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clark Colin C Et Al → Mine No 1; 1981-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clark Colin C Et Al → April Coal Company Inc; 1981-08-10 to current/open; source msha-controller-operator-history