# Relationship history for MSHA mine 4400793

Current hierarchy: **Robert  Nichols → Spring Hollow Coal Company Inc → No 3 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:** O'Quinn & Belcher → No 3 Mine; 1950-01-01 to 1972-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Belcher Vernon → No 3 Mine; 1950-01-01 to 1972-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Belcher Vernon → O'Quinn & Belcher; 1950-01-01 to 1972-02-29; source msha-controller-operator-history
- **operator_operates_mine:** J & G Coal Company → No 3 Mine; 1972-03-01 to 1972-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Dell Lonzo → No 3 Mine; 1972-03-01 to 1972-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Dell Lonzo → J & G Coal Company; 1972-03-01 to 1972-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Spring Hollow Coal Company Inc → No 3 Mine; 1972-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Nichols → No 3 Mine; 1972-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Nichols → Spring Hollow Coal Company Inc; 1972-06-01 to current/open; source msha-controller-operator-history