The Sparkplug is published four times per year by the District Lodge 190, International Association of Machinists, Oakland, CA, a non-profit organization. Subscriptions are $3 per year.

The Sparkplug is the official publication of District Lodge 190 and its affiliated local lodges and notification of any meeting or election in this paper shall constitute official notice per Article B, Section 4 of the IAMAW Constitution and Article V and VII of District Lodge 190 By-Laws.

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