# Relationship history for MSHA mine 4606100

Current hierarchy: **Keeney Robert H → K & W Welding Inc → #2 Appalantic Deep 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

- **controller_controls_mine:** Martin Carl → #2 Appalantic Deep Mine; 1977-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Appalantic Corp → #2 Appalantic Deep Mine; 1980-01-01 to 1982-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Martin Carl → Appalantic Corp; 1980-01-01 to 1982-03-08; source msha-controller-operator-history
- **operator_operates_mine:** General Resources Corp → #2 Appalantic Deep Mine; 1982-03-09 to 1983-01-10; source msha-controller-operator-history
- **controller_controls_mine:** Di Vita Paul → #2 Appalantic Deep Mine; 1982-03-09 to 1983-01-10; source msha-controller-operator-history
- **controller_controls_operator:** Di Vita Paul → General Resources Corp; 1982-03-09 to 1983-01-10; source msha-controller-operator-history
- **operator_operates_mine:** K & W Welding Inc → #2 Appalantic Deep Mine; 1983-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keeney Robert H → #2 Appalantic Deep Mine; 1983-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keeney Robert H → K & W Welding Inc; 1983-01-11 to current/open; source msha-controller-operator-history