Central Rocket Company was run by Richard Goldsmith who was old pyrotechnic buddies with Orv Carlisle.

IF you read this closely you will notice that it shows the intersection between pyrotechnic black powder motors and current black powder model rocket motors. CRC later sold Orv Carlsile's Rock-A-Chute model rockets and motors after MMI began to fall apart ,in 1959-1960.

attached are 2 pics of CRC rockets circa 1959-1960 and a May 1960 Ad where CRC is selling MMI kits, parts,etc

In searching old Popular Science ads, they had ads selling chemicals and plans from 1958 to 1969

https://airandspace.si.edu/collecti...sm_A19930489000

https://www.oldrocketforum.com/arch...php/t-1242.html

https://plans.rocketshoppe.com/pubs..._62_Catalog.pdf

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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them.