1.07layershttps://www.7layers.com/en/hardegenhttps://www.7layers.com/en/author/hardegen/PTCRB celebrates 20th anniversary - 7layersrich600338<blockquote class="wp-embedded-content" data-secret="bTSOLsDgtR"><a href="https://www.7layers.com/en/ptcrb-celebrates-20th-anniversary/">PTCRB celebrates 20th anniversary</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.7layers.com/en/ptcrb-celebrates-20th-anniversary/embed/#?secret=bTSOLsDgtR" width="600" height="338" title="“PTCRB celebrates 20th anniversary” — 7layers" data-secret="bTSOLsDgtR" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript">
/* <![CDATA[ */
/*! This file is auto-generated */
!function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document);
//# sourceURL=https://www.7layers.com/wp-includes/js/wp-embed.min.js
/* ]]> */
</script>
PTCRB celebrates 20th anniversary Last week the North American certification forum PTCRB celebrated its 20th anniversary in Toronto Cellular digital communication based on GSM was started in North America middle of the 90s. During 1997 the then cellular carriers Bell South, Microcell, Western Wireless and others, initiated a new certification scheme for Mobile Phones, called “PTCRB”. […]https://www.7layers.com/wp-content/uploads/20170614_180256-300x225.jpg