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"No one has ever produced a statement of fact that was technically true. The most accurate statements of science we have today are accurate to only 15 decimal places."
- Bart Kosko

Power Holster  
  Puts the sidearm right in your hand.  

"This is the secret of the power holster," Brucco said, tapping the flexible cable. "It is perfectly loose while you are using the weapon. But when you want it returned to the holster-" Brucco made an adjustment and the cable became a stiff rod that whipped the gun from Jason's hand and suspended it in midair.

"Then the return." The rod cable whirred and snapped the gun back into the holster. "The drawing action is the opposite of this, of course."

"A great gadget," Jason said. "But how do I draw? Do I whistle or something for the gun to pop out?"

"No, it is not sonic control," Brucco answered with a sober face. "It is much more precise than that. Here, take your left hand and grasp an imaginary gunbutt. Tense your trigger finger. Do you notice the pattern of the tendons in the wrist? Sensitive actuators touch the tendons in your right wrist. They ignore all patterns except the one that says hand ready to receive gun. After a time the mechanism becomes completely automatic. When you want the gun, it is in your hand. When you don't, it is in the holster."

From Deathworld, by Harry Harrison.
Published by Astounding Science Fiction in 1960
Additional resources -

It's necessary to use a special device to adjust the power holster for a particular user:

"Every gun is fitted to its owner and would be useless on anyone else," Brucco said. "I'll show you why." He led Jason to an armory jammed with deadly weapons. "Put your arm in this while I make the adjustments."

It was a box-like machine with a pistol grip on the side. Jason clutched the grip and rested his elbow on a metal loop. Brucco fixed pointers that touched his arm, then copied the results from the meters. Reading the figures from his list, he selected various components from bins and quickly assembled a power holster and gun. With the holster strapped to his forearm and the gun in his hand, Jason noticed for the first time they were connected by a flexible cable. The gun fitted his hand perfectly.

Thanks to Ashley for suggesting this item from Winchell Chung's sidearms page from Project Rho.

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Additional resources:
  More Ideas and Technology from Deathworld
  More Ideas and Technology by Harry Harrison
  Tech news articles related to Deathworld
  Tech news articles related to works by Harry Harrison

Power Holster-related news articles:
  - MYO Armband Provides Control For Your Phone, UAV
  - Muscle-Computer Interface Video
  - Myo Armband Controller Just 149 Bucks
  - Myo-Controlled Prosthetic Arm

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