# Relationship history for MSHA mine 1516226

Current hierarchy: **Wells Dennis → Alex Coal Company → #1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Walters Jeff Et Al → #1 Mine; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lanham Harvey Et Al → #1 Mine; 1985-08-28 to 1992-06-01; source msha-controller-operator-history
- **operator_operates_mine:** J & W Coal Company Corp → #1 Mine; 1987-10-01 to 1988-12-04; source msha-controller-operator-history
- **controller_controls_operator:** Walters Jeff Et Al → J & W Coal Company Corp; 1987-10-01 to 1988-12-04; source msha-controller-operator-history
- **operator_operates_mine:** Daisy Coal → #1 Mine; 1988-12-05 to 1989-05-25; source msha-controller-operator-history
- **controller_controls_mine:** Childers Barney Et Al → #1 Mine; 1988-12-05 to 1989-05-25; source msha-controller-operator-history
- **controller_controls_operator:** Childers Barney Et Al → Daisy Coal; 1988-12-05 to 1989-05-25; source msha-controller-operator-history
- **operator_operates_mine:** Hard Rock Mining → #1 Mine; 1989-05-26 to 1989-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Davis Elmer B Jr Et Al → #1 Mine; 1989-05-26 to 1989-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Davis Elmer B Jr Et Al → Hard Rock Mining; 1989-05-26 to 1989-08-30; source msha-controller-operator-history
- **operator_operates_mine:** Hard Rock Mining → #1 Mine; 1989-08-31 to 1989-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Nichols David L - Gary L Fry Et Al → #1 Mine; 1989-08-31 to 1989-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Nichols David L - Gary L Fry Et Al → Hard Rock Mining; 1989-08-31 to 1989-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Hard Rock Mining Company → #1 Mine; 1989-09-22 to 1990-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Saylor Larry - Terry Et Al → #1 Mine; 1989-09-22 to 1990-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Saylor Larry - Terry Et Al → Hard Rock Mining Company; 1989-09-22 to 1990-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Tryco Coal Company → #1 Mine; 1990-02-13 to 1990-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Lanham Roy Et Al → #1 Mine; 1990-02-13 to 1991-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Lanham Roy Et Al → Tryco Coal Company; 1990-02-13 to 1990-04-23; source msha-controller-operator-history
- **operator_operates_mine:** Try Co Coal Company → #1 Mine; 1990-04-24 to 1990-08-23; source msha-controller-operator-history
- **controller_controls_mine:** Childers Barney Et Al → #1 Mine; 1990-04-24 to 1990-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Childers Barney Et Al → Try Co Coal Company; 1990-04-24 to 1990-08-23; source msha-controller-operator-history
- **operator_operates_mine:** Tryco Coal Company → #1 Mine; 1990-08-24 to 1991-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Lanham Roy Et Al → Tryco Coal Company; 1990-08-24 to 1991-03-05; source msha-controller-operator-history
- **operator_operates_mine:** M & R Coal Company → #1 Mine; 1991-03-06 to 1992-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Lanham Harvey Et Al → M & R Coal Company; 1991-03-06 to 1992-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Cnoe Coal Company → #1 Mine; 1992-06-02 to 1993-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Howard Eddie Et Al → #1 Mine; 1992-06-02 to 1993-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Howard Eddie Et Al → Cnoe Coal Company; 1992-06-02 to 1993-08-30; source msha-controller-operator-history
- **operator_operates_mine:** Alex Coal Company → #1 Mine; 1993-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wells Dennis → #1 Mine; 1993-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wells Dennis → Alex Coal Company; 1993-08-31 to current/open; source msha-controller-operator-history