# Relationship history for MSHA mine 2600985

Current hierarchy: **Ralph  Showalter → Wells Tungsten → Wells Tungsten Mill**

- 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:** Norman E Ludwig → Wells Tungsten Mill; 1950-01-01 to 1978-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Ludwig Norman E → Wells Tungsten Mill; 1950-01-01 to 1981-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Ludwig Norman E → Norman E Ludwig; 1950-01-01 to 1978-06-19; source msha-controller-operator-history
- **operator_operates_mine:** Double Eagle Inc → Wells Tungsten Mill; 1978-06-20 to 1978-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Jim  Brown → Wells Tungsten Mill; 1978-06-20 to 1978-10-09; source msha-controller-operator-history
- **controller_controls_operator:** Jim  Brown → Double Eagle Inc; 1978-06-20 to 1978-10-09; source msha-controller-operator-history
- **operator_operates_mine:** South Hecla Mining & Drilling Corp → Wells Tungsten Mill; 1978-10-10 to 1980-12-29; source msha-controller-operator-history
- **controller_controls_mine:** Young Steven → Wells Tungsten Mill; 1978-10-10 to 1980-12-29; source msha-controller-operator-history
- **controller_controls_operator:** Young Steven → South Hecla Mining & Drilling Corp; 1978-10-10 to 1980-12-29; source msha-controller-operator-history
- **operator_operates_mine:** Great West Land & Mining Corp → Wells Tungsten Mill; 1980-12-30 to 1984-06-05; source msha-controller-operator-history
- **controller_controls_mine:** Lee Sheldon E → Wells Tungsten Mill; 1980-12-30 to 1984-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Lee Sheldon E → Great West Land & Mining Corp; 1980-12-30 to 1984-06-05; source msha-controller-operator-history
- **operator_operates_mine:** Geo Gold & Silver Corp → Wells Tungsten Mill; 1984-06-06 to 2018-09-10; source msha-controller-operator-history
- **controller_controls_mine:** Arnold David C → Wells Tungsten Mill; 1984-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arnold David C → Geo Gold & Silver Corp; 1984-06-06 to 2018-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Wells Tungsten → Wells Tungsten Mill; 2018-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ralph  Showalter et al → Wells Tungsten Mill; 2018-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph  Showalter et al → Wells Tungsten; 2018-09-11 to current/open; source msha-controller-operator-history