# Relationship history for MSHA mine 3303597

Current hierarchy: **Thomas  Scholl → Keystone Terminals → Keystone Terminals**

- 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:** Rail-River Terminal Company → Keystone Terminals; 1977-03-01 to 1978-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Edwin F  Russo → Keystone Terminals; 1977-03-01 to 1978-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Edwin F  Russo → Rail-River Terminal Company; 1977-03-01 to 1978-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Rail River Terminal Company → Keystone Terminals; 1978-04-19 to 1979-08-19; source msha-controller-operator-history
- **controller_controls_mine:** William T  Lively → Keystone Terminals; 1978-04-19 to 1979-08-19; source msha-controller-operator-history
- **controller_controls_operator:** William T  Lively → Rail River Terminal Company; 1978-04-19 to 1979-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Rail River Terminal Company → Keystone Terminals; 1979-08-20 to 1985-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Pittston Company → Keystone Terminals; 1979-08-20 to 1985-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Rail River Terminal Company; 1979-08-20 to 1985-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Coaldock Inc → Keystone Terminals; 1985-09-17 to 1986-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Austin J  McGinn → Keystone Terminals; 1985-09-17 to 1986-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Austin J  McGinn → Coaldock Inc; 1985-09-17 to 1986-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Rail River Terminal → Keystone Terminals; 1986-11-01 to 2001-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Jimmy D  Kulbeth → Keystone Terminals; 1986-11-01 to 2001-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy D  Kulbeth → Rail River Terminal; 1986-11-01 to 2001-02-26; source msha-controller-operator-history
- **operator_operates_mine:** Keystone Terminals → Keystone Terminals; 2001-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Scholl → Keystone Terminals; 2001-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Scholl → Keystone Terminals; 2001-02-27 to current/open; source msha-controller-operator-history