# Relationship history for MSHA mine 1505250

Current hierarchy: **Jimmy E  Hamilton → Hammer Coal Company Inc → Tipple**

- 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:** Blue Gem Coal & Land Corp → Tipple; 1950-01-01 to 1980-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Callihan Ronnie D → Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Callihan Ronnie D → Blue Gem Coal & Land Corp; 1950-01-01 to 1980-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Thomas R  Hamilton et al → Tipple; 1974-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adams Resources & Energy Inc → Tipple; 1976-05-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Plastics Universal Corp → Tipple; 1980-06-10 to 1981-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Adams Resources & Energy Inc → Plastics Universal Corp; 1980-06-10 to 1981-09-23; source msha-controller-operator-history
- **operator_operates_mine:** J-Ray Inc → Tipple; 1981-09-24 to 1982-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Payne Ray → Tipple; 1981-09-24 to 1982-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Payne Ray → J-Ray Inc; 1981-09-24 to 1982-08-25; source msha-controller-operator-history
- **operator_operates_mine:** Hammer Coal Company Inc → Tipple; 1982-08-26 to 1986-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Jimmy E  Hamilton et al → Tipple; 1982-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy E  Hamilton et al → Hammer Coal Company Inc; 1982-08-26 to 1986-06-02; source msha-controller-operator-history
- **operator_operates_mine:** Nally & Hamilton Enterprises Inc → Tipple; 1986-06-03 to 1990-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Thomas R  Hamilton et al → Nally & Hamilton Enterprises Inc; 1986-06-03 to 1990-06-05; source msha-controller-operator-history
- **operator_operates_mine:** Hammer Coal Company Inc → Tipple; 1990-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy E  Hamilton et al → Hammer Coal Company Inc; 1990-06-06 to current/open; source msha-controller-operator-history