# Relationship history for MSHA mine 1516166

Current hierarchy: **John  Helton → Beggar Coal Company → No 4 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:** Bic Coal Company Inc → No 4 Mine; 1987-09-01 to 1996-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Middleton Mary Lynn Et Al → No 4 Mine; 1987-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Middleton Mary Lynn Et Al → Bic Coal Company Inc; 1987-09-01 to 1996-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Vanco Coal Company Inc → No 4 Mine; 1996-08-20 to 1997-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Tim → No 4 Mine; 1996-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Tim → Vanco Coal Company Inc; 1996-08-20 to 1997-08-18; source msha-controller-operator-history
- **controller_controls_mine:** John  Helton → No 4 Mine; 1997-04-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & J Mining Inc → No 4 Mine; 1997-08-19 to 1997-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Dennis → No 4 Mine; 1997-08-19 to 1997-08-28; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Dennis → J & J Mining Inc; 1997-08-19 to 1997-08-28; source msha-controller-operator-history
- **operator_operates_mine:** J & J Mining Inc → No 4 Mine; 1997-08-29 to 1998-02-16; source msha-controller-operator-history
- **controller_controls_mine:** Noe Joe → No 4 Mine; 1997-08-29 to 1998-02-16; source msha-controller-operator-history
- **controller_controls_operator:** Noe Joe → J & J Mining Inc; 1997-08-29 to 1998-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Mac Coal Company → No 4 Mine; 1998-02-17 to 1999-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Mc Millian Robert → No 4 Mine; 1998-02-17 to 1999-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Mc Millian Robert → Mac Coal Company; 1998-02-17 to 1999-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Beggar Coal Company → No 4 Mine; 1999-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Helton → Beggar Coal Company; 1999-03-30 to current/open; source msha-controller-operator-history