# Relationship history for MSHA mine 1506372

Current hierarchy: **Tackett Curtiss → C & N Coal Company → No 1 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:** Carl Moore Coal Company Inc → No 1 Tipple; 1973-01-01 to 1976-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Moore Carl → No 1 Tipple; 1973-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moore Carl → Carl Moore Coal Company Inc; 1973-01-01 to 1976-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Tackett Curtiss → No 1 Tipple; 1974-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Colley Theodore T Jr & G Frank Ramsey → No 1 Tipple; 1974-09-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Colley & Ramsey Coal Company → No 1 Tipple; 1976-07-13 to 1989-10-10; source msha-controller-operator-history
- **controller_controls_operator:** Colley Theodore T Jr & G Frank Ramsey → Colley & Ramsey Coal Company; 1976-07-13 to 1989-10-10; source msha-controller-operator-history
- **operator_operates_mine:** C & N Coal Company → No 1 Tipple; 1989-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tackett Curtiss → C & N Coal Company; 1989-10-11 to current/open; source msha-controller-operator-history