The history of innovation is fascinating & extends even to inventions related to the Holiday Season. The colored images of inventions related to the Holiday Season on these six cards are based on original black-and-white line drawings from United States Patents U.S. 85,501, U.S. 90,441, U.S. 531,452, U.S. 1,068,147, U.S. 1,294,253, & U.S. 2,294,241 all issuing as patents between the years 1868 - 1940. An informative & educational description of how these Holiday Season inventions work is on the back of each card. All intellectual property rights in these cards are owned by sprk.plug image llc. Product Details: -The colored images on these cards were originally created using the Adobe Creative Suite. -The cards are professionally printed using 4-color cmYK off-set printing on a Heidelberg Printing Press with a Gloss UV coating to sharpen & brighten the image. -The cards & self-sealing envelopes are size A7 (5 x 7) & are each packaged in a cellophane sleeve. -The cards are made from sturdy 120# dull/matte stock. -The cards are mailed in a 9.5 x 7.5 protective bubble mailer. Order Details: -If your order is damaged on arrival, let me know within 30 days of the date of placing your order & I will make it right. -Please contact me to discuss wholesale orders & pricing. Set Of Six Holiday Season Cards, Sprk.plug Image Greeting Cards