card # 20 . usa .

postcard no.: 20

how i got it: given to me (not mailed) by my dad who received it in the mail from a company

details from back of postcard:
(no details about the image on the postcard)

comments:
Another ad card. This one was sent to my dad, inviting him to a convention by the American company SEL that was hosted by the Canadian Electricity Association.