PRLB vs MUC Comparison

Proto Labs Inc is an on-demand manufacturer of custom parts for prototyping and short-run production. The company offers developers and engineers quick-turn production services to reduce the time to market. Proto Labs uses injection molding, computer numerical control machining, and 3-D printing to manufacture custom parts for its clients. The company services clients' needs for prototype solutions, parts for testing procedures, bridge production capabilities during disruptions in manufacturing processes, limited-quantity requests, and end-of-life production support. Geographically, a majority of the company's revenue is derived from the United States and the rest from Europe.

BlackRock MuniHoldings California Quality Fund Inc is a diversified, closed-end management investment company. Its investment objective is to provide shareholders with current income exempt from U.S. federal income taxes and California personal income taxes. The fund mainly invests in municipal obligations exempt from U.S. federal income taxes (except that the interest may be subject to the U.S. federal alternative minimum tax) and California personal income taxes. Under normal market conditions, it invests a majority of its managed assets in investment-grade municipal obligations with remaining maturities of one year or more at the time of investment. It can also invest in below investment-grade securities, or directly in such securities or synthetically through the use of derivatives.