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| Software: RF Cascade Workbook | RF Symbols for Office | RF Symbols & Stencils for Visio | Espresso Workbook | ||||||||||
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Please Support RF Cafe by purchasing my ridiculously low-priced products, all of which I created. RF & Electronics Symbols for Visio RF & Electronics Symbols for Office RF & Electronics Stencils for Visio T-Shirts, Mugs, Cups, Ball Caps, Mouse Pads These Are Available for Free |
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Reader Service Cards
May 1969 Electronics World
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May 1969 Electronics World 
Table of Contents
Wax nostalgic about and learn from the history of early electronics. See articles from Electronics World, published May 1959 - December 1971. All copyrights hereby acknowledged. |
Are you old enough to remember when Reader Service Cards were inserted into the binding of magazines? They were the old world version of website URLs and QR (quick response) scan codes. Each advertisement in the magazine had a Reader Service Number printed on it, so you would take your pen and draw circles around the matching numbers on the Reader Service card, then mail it to the publisher. Sometimes it would take months to get information in return - if you got it at all. A typical Reader Service Card is shown below. Look at the bottom of the Poly Paks ad to see "Circle No. 96 on Reader Service Card."
Electronics-Themed Comics
Reader Service Card
Poly Paks Ad with Reader Service number at the bottom
Posted February 15, 2018
Copyright: 1996 - 2026 |
About RF Cafe RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived... |
Copyright 1996 - 2026 All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledge My Hobby Website: My Daughter's Website: |
