When was plastic explosives invented?

When did MH Lummerzheim Liege produce the double barrel 410? Are richland guns good quality? Where do you find sweat shops? What is the value of a sears 22 caliber rifle model number 273-2340? How old is my Revelation 30-06 Model? Is there 22 caliber shot shells not bullets? What is value of a London Fine Twist double-barrel shotgun? How old is a colt 38 pistol with serial 36249? What is value of Remington 22 cal model 572? What year was this Colt New Service 45 Long Colt revolver made The serial numbers on the gun are 112581? What year is harrington richardson topper model 88 AX434448? What is a hammer ring? How many browning model 71 348 were made? When was your beretta 950 B made? What is the value of Beretta silver pigeon 20 ga? What are the values of JC Higgins Models 44 DL Model 43 Model 42 and Model 45? What is the age of a JC Higgins 20 gauge bolt action? What is the value of an El Faison 410 double barrel shotgun? What is the best length barrel for a 357 magnum? What brand is the best AR-15?