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From: Ron Natalie 
Newsgroups: net.music
Subject: A Unique Sound Experience
Message-ID: <7325@brl-tgr.ARPA>
Date: Mon, 14-Jan-85 17:46:55 EST
Article-I.D.: brl-tgr.7325
Posted: Mon Jan 14 17:46:55 1985
Date-Received: Sun, 20-Jan-85 01:43:43 EST
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Organization: Ballistic Research Lab
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I just had to buy one when I read the box...

The LP VIBRA-SLAP (pat. no. 3439572)

A Unique Sound Experience!

Latin American - Classical - Rock

Designed and patented by Martin Cohen, founder and president of
Latin Percussion, to serve as a durable and reliable replacement
for the jawbone of an ass.  Unlike its natural counterpart, VIBRA-SLAP,
properly used will give years of trouble-free, dependable service.

...

Goes great with my flexatone.

-Ron