WELCH (W. M.) MANUFACTURING CO.
Scientific instruments laboratory apparatus and supplies for high schools, physics, chemistry, biology, and general science; 1933-34 catalog. Appl. author: Glenn M. Hobbs, employee for hire.
WELCH (W. M.) MANUFACTURING CO. Scientific instruments laboratory apparatus and supplies for high schools, physics, chemistry, biology, and general science; 1933-34 catalog. Appl. author: Glenn M. Hobbs, employee for hire. © 11Sep33; AA128605. Welch Scientific Co. (PWH); 7Aug61; R280007.
Welch Scientific Co.|PWH