Miniature Engineering Museum: RimFire V Model Engine Spark Plug
Miniature Engineering Museum: World Famous RimFire Spark Plugs by Paul Knapp, AZ, 1993
Miniature Engineering Museum: World's Smallest Spark Plugs - RIMFIRE For Small Engines
Miniature Engineering Museum: RimFire 1/4-32 Spark Plug Specs
Miniature Engineering Museum: Bentley BR2, Cylinder Assembly and RimFire VR2 Spark Plugs
Miniature Engineering Museum: RimFire Spark Plug Crosses the Atlantic in 1998
Miniature Engineering Museum: Miniature Model Engine Spark Plugs by Dale Detrich, OH, 2005
Miniature Engineering Museum: NGK ME8 Model Engine Spark Plug and Cutaway
Miniature Engineering Museum: Custom Made Spark Plug by Werner Landemann, circa 1990
Miniature Engineering Museum: Lodge 3/8-24 Model Engine Spark Plug and Cutaway, UK
Miniature Engineering Museum: RimFire Spark Plugs, Early Prototypes, 1/4-32 and 10-40 Threads, 1990's
Miniature Engineering Museum: Vintage OS Model Airplane Spark Plug, Japan, circa 1940's
Miniature Engineering Museum: Blue Crown A2 Model Engine Spark Plug.
Miniature Engineering Museum: Champion V1 (EX1) Miniature Experimental Model Engine Spark Plug
Miniature Engineering Museum: RENTZ Model Engine Spark Plugs by Roger Ronnie SD
Miniature Engineering Museum: Champion V X1 Experimental Model Engine Spark Plug
Miniature Engineering Museum: Japanese Brass and Mica Model Engine Spark Plug, 1946
Miniature Engineering Museum: BERU Model Engine Spark Plug and Cutaway
Miniature Engineering Museum: Champion V1 (EX1) Miniature Experimental Model Engine Spark Plug
Miniature Engineering Museum: Champ V21 X2 Experimental Model Engine Spark Plug
Miniature Engineering Museum: Champion Gold V Model Engine Spark Plug and Cutaway
Miniature Engineering Museum: ELF Spark Plug, Insulator by Champion, 1936
Miniature Engineering Museum: Brown Junior Motors Model Engine Spark Plug and Cutaway
Miniature Engineering Museum: M-4 Model Engine Spark Plug by Bob Manske, US
Miniature Engineering Museum: NGK ME2 Miniature Spark Plug, Japan, circa 1940
Miniature Engineering Museum: NGK ME7 Model Engine Spark Plug, Japan, 1940
Miniature Engineering Museum: NGK ME7, 10mm Model Engne Spark Plug, Japan, 1940
Miniature Engineering Museum: Pacy 38 S2 Model Engine Spark Plug, UK
Miniature Engineering Museum: RICHLY Miniature Model Engine Spark Plug
Miniature Engineering Museum: ZK Model Engine Spark Plug, Czech Republic