# Relationship history for MSHA mine 1515314

Current hierarchy: **Pmc Holding & Investment Company Inc → G D & M Coal Company Inc → No 2**

- 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:** George  Newsom → No 2; 1985-03-26 to 1986-03-31; source msha-controller-operator-history
- **operator_operates_mine:** G D & M Coal Company Inc → No 2; 1985-08-01 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_operator:** George  Newsom → G D & M Coal Company Inc; 1985-08-01 to 1986-03-31; source msha-controller-operator-history
- **operator_operates_mine:** G D & M Coal Company Inc → No 2; 1986-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pmc Holding & Investment Company Inc → No 2; 1986-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pmc Holding & Investment Company Inc → G D & M Coal Company Inc; 1986-04-01 to current/open; source msha-controller-operator-history