# Relationship history for MSHA mine 3601137

Current hierarchy: **Laney Marlin L → Laney Coal Company → No 9 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

- **operator_operates_mine:** Joseph Tocarchich Coal Company → No 9 Mine; 1950-01-01 to 1974-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Tocarchich Joseph Coal Company → No 9 Mine; 1950-01-01 to 1974-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Tocarchich Joseph Coal Company → Joseph Tocarchich Coal Company; 1950-01-01 to 1974-08-29; source msha-controller-operator-history
- **operator_operates_mine:** L & A Coal Company → No 9 Mine; 1974-08-30 to 1976-05-14; source msha-controller-operator-history
- **controller_controls_mine:** L & A Coal Company → No 9 Mine; 1974-08-30 to 1976-05-14; source msha-controller-operator-history
- **controller_controls_operator:** L & A Coal Company → L & A Coal Company; 1974-08-30 to 1976-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Laney Coal Company → No 9 Mine; 1976-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Laney Marlin L → No 9 Mine; 1976-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laney Marlin L → Laney Coal Company; 1976-05-15 to current/open; source msha-controller-operator-history